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

Comparing jsr166/src/test/tck/LinkedBlockingQueueTest.java (file contents):
Revision 1.2 by dl, Sun Sep 7 20:39:11 2003 UTC vs.
Revision 1.84 by jsr166, Wed Jan 27 02:55:18 2021 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.*;
13	<
14	<	public class LinkedBlockingQueueTest extends TestCase {
15	<
16	<	private static int N = 10;
17	<	private static long SHORT_DELAY_MS = 100;
18	<	private static long MEDIUM_DELAY_MS = 1000;
19	<	private static long LONG_DELAY_MS = 10000;
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 JSR166TestCase.itemFor(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
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	>	* Items 0 ... n - 1.
60		*/
61	<	private LinkedBlockingQueue fullQueue(int n) {
62	<	LinkedBlockingQueue q = new LinkedBlockingQueue(n);
61	>	private static LinkedBlockingQueue<Item> populatedQueue(int n) {
62	>	LinkedBlockingQueue<Item> 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	>	mustOffer(q, i);
66		assertFalse(q.isEmpty());
67	<	assertEquals(0, q.remainingCapacity());
68	<	assertEquals(n, q.size());
67	>	mustEqual(0, q.remainingCapacity());
68	>	mustEqual(n, q.size());
69	>	mustEqual(0, q.peek());
70		return q;
71		}
72	<
73	<	public void testConstructor1(){
74	<	assertEquals(N, new LinkedBlockingQueue(N).remainingCapacity());
72	>
73	>	/**
74	>	* A new queue has the indicated capacity, or Integer.MAX_VALUE if
75	>	* none given
76	>	*/
77	>	public void testConstructor1() {
78	>	mustEqual(SIZE, new LinkedBlockingQueue<Item>(SIZE).remainingCapacity());
79	>	mustEqual(Integer.MAX_VALUE, new LinkedBlockingQueue<Item>().remainingCapacity());
80		}
81
82	<	public void testConstructor2(){
82	>	/**
83	>	* Constructor throws IllegalArgumentException if capacity argument nonpositive
84	>	*/
85	>	public void testConstructor2() {
86		try {
87	<	LinkedBlockingQueue q = new LinkedBlockingQueue(0);
88	<	fail("Cannot make zero-sized");
89	<	}
52	<	catch (IllegalArgumentException success) {}
87	>	new LinkedBlockingQueue<Item>(0);
88	>	shouldThrow();
89	>	} catch (IllegalArgumentException success) {}
90		}
91
92	<	public void testConstructor3(){
93	<
92	>	/**
93	>	* Initializing from null Collection throws NullPointerException
94	>	*/
95	>	public void testConstructor3() {
96		try {
97	<	LinkedBlockingQueue q = new LinkedBlockingQueue(null);
98	<	fail("Cannot make from null collection");
99	<	}
61	<	catch (NullPointerException success) {}
97	>	new LinkedBlockingQueue<Item>(null);
98	>	shouldThrow();
99	>	} catch (NullPointerException success) {}
100		}
101
102	<	public void testConstructor4(){
102	>	/**
103	>	* Initializing from Collection of null elements throws NullPointerException
104	>	*/
105	>	public void testConstructor4() {
106	>	Collection<Item> elements = Arrays.asList(new Item[SIZE]);
107		try {
108	<	Integer[] ints = new Integer[N];
109	<	LinkedBlockingQueue q = new LinkedBlockingQueue(Arrays.asList(ints));
110	<	fail("Cannot make with null elements");
69	<	}
70	<	catch (NullPointerException success) {}
108	>	new LinkedBlockingQueue<Item>(elements);
109	>	shouldThrow();
110	>	} catch (NullPointerException success) {}
111		}
112
113	<	public void testConstructor5(){
114	<	try {
115	<	Integer[] ints = new Integer[N];
116	<	for (int i = 0; i < N-1; ++i)
117	<	ints[i] = new Integer(i);
118	<	LinkedBlockingQueue q = new LinkedBlockingQueue(Arrays.asList(ints));
119	<	fail("Cannot make with null elements");
120	<	}
121	<	catch (NullPointerException success) {}
113	>	/**
114	>	* Initializing from Collection with some null elements throws
115	>	* NullPointerException
116	>	*/
117	>	public void testConstructor5() {
118	>	Item[] items = new Item[2];
119	>	items[0] = zero;
120	>	Collection<Item> elements = Arrays.asList(items);
121	>	try {
122	>	new LinkedBlockingQueue<Item>(elements);
123	>	shouldThrow();
124	>	} catch (NullPointerException success) {}
125		}
126
127	<	public void testConstructor6(){
128	<	try {
129	<	Integer[] ints = new Integer[N];
130	<	for (int i = 0; i < N; ++i)
131	<	ints[i] = new Integer(i);
132	<	LinkedBlockingQueue q = new LinkedBlockingQueue(Arrays.asList(ints));
133	<	for (int i = 0; i < N; ++i)
134	<	assertEquals(ints[i], q.poll());
92	<	}
93	<	finally {}
127	>	/**
128	>	* Queue contains all elements of collection used to initialize
129	>	*/
130	>	public void testConstructor6() {
131	>	Item[] items = defaultItems;
132	>	LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(Arrays.asList(items));
133	>	for (int i = 0; i < SIZE; ++i)
134	>	mustEqual(items[i], q.poll());
135		}
136
137	+	/**
138	+	* Queue transitions from empty to full when elements added
139	+	*/
140		public void testEmptyFull() {
141	<	LinkedBlockingQueue q = new LinkedBlockingQueue(2);
141	>	LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(2);
142		assertTrue(q.isEmpty());
143	<	assertEquals("should have room for 2", 2, q.remainingCapacity());
144	<	q.add(new Integer(1));
143	>	mustEqual(2, q.remainingCapacity());
144	>	q.add(one);
145		assertFalse(q.isEmpty());
146	<	q.add(new Integer(2));
146	>	q.add(two);
147		assertFalse(q.isEmpty());
148	<	assertEquals("queue should be full", 0, q.remainingCapacity());
149	<	assertFalse("offer should be rejected", q.offer(new Integer(3)));
148	>	mustEqual(0, q.remainingCapacity());
149	>	assertFalse(q.offer(three));
150		}
151
152	<	public void testRemainingCapacity(){
153	<	LinkedBlockingQueue q = fullQueue(N);
154	<	for (int i = 0; i < N; ++i) {
155	<	assertEquals(i, q.remainingCapacity());
156	<	assertEquals(N-i, q.size());
157	<	q.remove();
158	<	}
159	<	for (int i = 0; i < N; ++i) {
160	<	assertEquals(N-i, q.remainingCapacity());
161	<	assertEquals(i, q.size());
162	<	q.add(new Integer(i));
152	>	/**
153	>	* remainingCapacity decreases on add, increases on remove
154	>	*/
155	>	public void testRemainingCapacity() {
156	>	BlockingQueue<Item> q = populatedQueue(SIZE);
157	>	for (int i = 0; i < SIZE; ++i) {
158	>	mustEqual(i, q.remainingCapacity());
159	>	mustEqual(SIZE, q.size() + q.remainingCapacity());
160	>	mustEqual(i, q.remove());
161	>	}
162	>	for (int i = 0; i < SIZE; ++i) {
163	>	mustEqual(SIZE - i, q.remainingCapacity());
164	>	mustEqual(SIZE, q.size() + q.remainingCapacity());
165	>	mustAdd(q, i);
166		}
167		}
168
169	<	public void testOfferNull(){
170	<	try {
171	<	LinkedBlockingQueue q = new LinkedBlockingQueue(1);
172	<	q.offer(null);
173	<	fail("should throw NPE");
174	<	} catch (NullPointerException success) { }
169	>	/**
170	>	* Offer succeeds if not full; fails if full
171	>	*/
172	>	public void testOffer() {
173	>	LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(1);
174	>	assertTrue(q.offer(zero));
175	>	assertFalse(q.offer(one));
176		}
177
178	<	public void testOffer(){
179	<	LinkedBlockingQueue q = new LinkedBlockingQueue(1);
180	<	assertTrue(q.offer(new Integer(0)));
181	<	assertFalse(q.offer(new Integer(1)));
178	>	/**
179	>	* add succeeds if not full; throws IllegalStateException if full
180	>	*/
181	>	public void testAdd() {
182	>	LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(SIZE);
183	>	for (int i = 0; i < SIZE; ++i)
184	>	mustAdd(q, i);
185	>	mustEqual(0, q.remainingCapacity());
186	>	try {
187	>	q.add(new Item(SIZE));
188	>	shouldThrow();
189	>	} catch (IllegalStateException success) {}
190		}
191
192	<	public void testAdd(){
193	<	try {
194	<	LinkedBlockingQueue q = new LinkedBlockingQueue(N);
195	<	for (int i = 0; i < N; ++i) {
196	<	assertTrue(q.add(new Integer(i)));
197	<	}
198	<	assertEquals(0, q.remainingCapacity());
199	<	q.add(new Integer(N));
200	<	} catch (IllegalStateException success){
201	<	}
202	<	}
203	<
204	<	public void testAddAll1(){
205	<	try {
206	<	LinkedBlockingQueue q = new LinkedBlockingQueue(1);
207	<	q.addAll(null);
208	<	fail("Cannot add null collection");
209	<	}
210	<	catch (NullPointerException success) {}
211	<	}
212	<	public void testAddAll2(){
213	<	try {
214	<	LinkedBlockingQueue q = new LinkedBlockingQueue(N);
215	<	Integer[] ints = new Integer[N];
216	<	q.addAll(Arrays.asList(ints));
217	<	fail("Cannot add null elements");
218	<	}
219	<	catch (NullPointerException success) {}
220	<	}
221	<	public void testAddAll3(){
222	<	try {
223	<	LinkedBlockingQueue q = new LinkedBlockingQueue(N);
224	<	Integer[] ints = new Integer[N];
225	<	for (int i = 0; i < N-1; ++i)
226	<	ints[i] = new Integer(i);
227	<	q.addAll(Arrays.asList(ints));
228	<	fail("Cannot add null elements");
229	<	}
230	<	catch (NullPointerException success) {}
231	<	}
232	<	public void testAddAll4(){
233	<	try {
234	<	LinkedBlockingQueue q = new LinkedBlockingQueue(1);
235	<	Integer[] ints = new Integer[N];
236	<	for (int i = 0; i < N; ++i)
237	<	ints[i] = new Integer(i);
238	<	q.addAll(Arrays.asList(ints));
239	<	fail("Cannot add with insufficient capacity");
240	<	}
185	<	catch (IllegalStateException success) {}
186	<	}
187	<	public void testAddAll5(){
188	<	try {
189	<	Integer[] empty = new Integer[0];
190	<	Integer[] ints = new Integer[N];
191	<	for (int i = 0; i < N; ++i)
192	<	ints[i] = new Integer(i);
193	<	LinkedBlockingQueue q = new LinkedBlockingQueue(N);
194	<	assertFalse(q.addAll(Arrays.asList(empty)));
195	<	assertTrue(q.addAll(Arrays.asList(ints)));
196	<	for (int i = 0; i < N; ++i)
197	<	assertEquals(ints[i], q.poll());
198	<	}
199	<	finally {}
200	<	}
201	<
202	<	public void testPutNull() {
203	<	try {
204	<	LinkedBlockingQueue q = new LinkedBlockingQueue(N);
205	<	q.put(null);
206	<	fail("put should throw NPE");
207	<	}
208	<	catch (NullPointerException success){
209	<	}
210	<	catch (InterruptedException ie) {
211	<	fail("Unexpected exception");
212	<	}
213	<	}
214	<
215	<	public void testPut() {
216	<	try {
217	<	LinkedBlockingQueue q = new LinkedBlockingQueue(N);
218	<	for (int i = 0; i < N; ++i) {
219	<	Integer I = new Integer(i);
220	<	q.put(I);
221	<	assertTrue(q.contains(I));
222	<	}
223	<	assertEquals(0, q.remainingCapacity());
224	<	}
225	<	catch (InterruptedException ie) {
226	<	fail("Unexpected exception");
227	<	}
228	<	}
229	<
230	<	public void testBlockingPut(){
231	<	Thread t = new Thread(new Runnable() {
232	<	public void run() {
233	<	int added = 0;
234	<	try {
235	<	LinkedBlockingQueue q = new LinkedBlockingQueue(N);
236	<	for (int i = 0; i < N; ++i) {
237	<	q.put(new Integer(i));
238	<	++added;
239	<	}
240	<	q.put(new Integer(N));
241	<	fail("put should block");
242	<	} catch (InterruptedException ie){
243	<	assertEquals(added, N);
244	<	}
245	<	}});
246	<	t.start();
247	<	try {
248	<	Thread.sleep(SHORT_DELAY_MS);
249	<	t.interrupt();
250	<	t.join();
251	<	}
252	<	catch (InterruptedException ie) {
253	<	fail("Unexpected exception");
254	<	}
192	>	/**
193	>	* addAll(this) throws IllegalArgumentException
194	>	*/
195	>	public void testAddAllSelf() {
196	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
197	>	try {
198	>	q.addAll(q);
199	>	shouldThrow();
200	>	} catch (IllegalArgumentException success) {}
201	>	}
202	>
203	>	/**
204	>	* addAll of a collection with any null elements throws NPE after
205	>	* possibly adding some elements
206	>	*/
207	>	public void testAddAll3() {
208	>	LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(SIZE);
209	>	Item[] items = new Item[2]; items[0] = zero;
210	>	Collection<Item> elements = Arrays.asList(items);
211	>	try {
212	>	q.addAll(elements);
213	>	shouldThrow();
214	>	} catch (NullPointerException success) {}
215	>	}
216	>
217	>	/**
218	>	* addAll throws IllegalStateException if not enough room
219	>	*/
220	>	public void testAddAll4() {
221	>	LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(SIZE - 1);
222	>	Item[] items = defaultItems;
223	>	Collection<Item> elements = Arrays.asList(items);
224	>	try {
225	>	q.addAll(elements);
226	>	shouldThrow();
227	>	} catch (IllegalStateException success) {}
228	>	}
229	>
230	>	/**
231	>	* Queue contains all elements, in traversal order, of successful addAll
232	>	*/
233	>	public void testAddAll5() {
234	>	Item[] empty = new Item[0];
235	>	Item[] items = defaultItems;
236	>	LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(SIZE);
237	>	assertFalse(q.addAll(Arrays.asList(empty)));
238	>	assertTrue(q.addAll(Arrays.asList(items)));
239	>	for (int i = 0; i < SIZE; ++i)
240	>	mustEqual(items[i], q.poll());
241		}
242
243	<	public void testPutWithTake() {
244	<	final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
245	<	Thread t = new Thread(new Runnable() {
246	<	public void run(){
247	<	int added = 0;
248	<	try {
249	<	q.put(new Object());
250	<	++added;
251	<	q.put(new Object());
266	<	++added;
267	<	q.put(new Object());
268	<	++added;
269	<	q.put(new Object());
270	<	++added;
271	<	fail("Should block");
272	<	} catch (InterruptedException e){
273	<	assertTrue(added >= 2);
274	<	}
275	<	}
276	<	});
277	<	try {
278	<	t.start();
279	<	Thread.sleep(SHORT_DELAY_MS);
280	<	q.take();
281	<	t.interrupt();
282	<	t.join();
283	<	} catch (Exception e){
284	<	fail("Unexpected exception");
243	>	/**
244	>	* all elements successfully put are contained
245	>	*/
246	>	public void testPut() throws InterruptedException {
247	>	LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(SIZE);
248	>	for (int i = 0; i < SIZE; ++i) {
249	>	Item x = itemFor(i);
250	>	q.put(x);
251	>	mustContain(q, x);
252		}
253	+	mustEqual(0, q.remainingCapacity());
254	+	}
255	+
256	+	/**
257	+	* put blocks interruptibly if full
258	+	*/
259	+	public void testBlockingPut() throws InterruptedException {
260	+	final LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(SIZE);
261	+	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
262	+	Thread t = newStartedThread(new CheckedRunnable() {
263	+	public void realRun() throws InterruptedException {
264	+	for (int i = 0; i < SIZE; ++i)
265	+	q.put(itemFor(i));
266	+	mustEqual(SIZE, q.size());
267	+	mustEqual(0, q.remainingCapacity());
268	+
269	+	Thread.currentThread().interrupt();
270	+	try {
271	+	q.put(ninetynine);
272	+	shouldThrow();
273	+	} catch (InterruptedException success) {}
274	+	assertFalse(Thread.interrupted());
275	+
276	+	pleaseInterrupt.countDown();
277	+	try {
278	+	q.put(ninetynine);
279	+	shouldThrow();
280	+	} catch (InterruptedException success) {}
281	+	assertFalse(Thread.interrupted());
282	+	}});
283	+
284	+	await(pleaseInterrupt);
285	+	if (randomBoolean()) assertThreadBlocks(t, Thread.State.WAITING);
286	+	t.interrupt();
287	+	awaitTermination(t);
288	+	mustEqual(SIZE, q.size());
289	+	mustEqual(0, q.remainingCapacity());
290	+	}
291	+
292	+	/**
293	+	* put blocks interruptibly waiting for take when full
294	+	*/
295	+	public void testPutWithTake() throws InterruptedException {
296	+	final int capacity = 2;
297	+	final LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(2);
298	+	final CountDownLatch pleaseTake = new CountDownLatch(1);
299	+	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
300	+	Thread t = newStartedThread(new CheckedRunnable() {
301	+	public void realRun() throws InterruptedException {
302	+	for (int i = 0; i < capacity; i++)
303	+	q.put(itemFor(i));
304	+	pleaseTake.countDown();
305	+	q.put(eightysix);
306	+
307	+	Thread.currentThread().interrupt();
308	+	try {
309	+	q.put(ninetynine);
310	+	shouldThrow();
311	+	} catch (InterruptedException success) {}
312	+	assertFalse(Thread.interrupted());
313	+
314	+	pleaseInterrupt.countDown();
315	+	try {
316	+	q.put(ninetynine);
317	+	shouldThrow();
318	+	} catch (InterruptedException success) {}
319	+	assertFalse(Thread.interrupted());
320	+	}});
321	+
322	+	await(pleaseTake);
323	+	mustEqual(0, q.remainingCapacity());
324	+	mustEqual(0, q.take());
325	+
326	+	await(pleaseInterrupt);
327	+	if (randomBoolean()) assertThreadBlocks(t, Thread.State.WAITING);
328	+	t.interrupt();
329	+	awaitTermination(t);
330	+	mustEqual(0, q.remainingCapacity());
331		}
332
333	+	/**
334	+	* timed offer times out if full and elements not taken
335	+	*/
336		public void testTimedOffer() {
337	<	final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
338	<	Thread t = new Thread(new Runnable() {
339	<	public void run(){
340	<	try {
341	<	q.put(new Object());
342	<	q.put(new Object());
343	<	assertFalse(q.offer(new Object(), SHORT_DELAY_MS/2, TimeUnit.MILLISECONDS));
344	<	q.offer(new Object(), LONG_DELAY_MS, TimeUnit.MILLISECONDS);
345	<	fail("Should block");
346	<	} catch (InterruptedException success){}
347	<	}
348	<	});
349	<
350	<	try {
351	<	t.start();
352	<	Thread.sleep(SHORT_DELAY_MS);
353	<	t.interrupt();
354	<	t.join();
355	<	} catch (Exception e){
356	<	fail("Unexpected exception");
357	<	}
337	>	final LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(2);
338	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
339	>	Thread t = newStartedThread(new CheckedRunnable() {
340	>	public void realRun() throws InterruptedException {
341	>	q.put(zero);
342	>	q.put(one);
343	>	long startTime = System.nanoTime();
344	>
345	>	assertFalse(q.offer(two, timeoutMillis(), MILLISECONDS));
346	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
347	>
348	>	Thread.currentThread().interrupt();
349	>	try {
350	>	q.offer(three, randomTimeout(), randomTimeUnit());
351	>	shouldThrow();
352	>	} catch (InterruptedException success) {}
353	>	assertFalse(Thread.interrupted());
354	>
355	>	pleaseInterrupt.countDown();
356	>	try {
357	>	q.offer(two, LONGER_DELAY_MS, MILLISECONDS);
358	>	shouldThrow();
359	>	} catch (InterruptedException success) {}
360	>	assertFalse(Thread.interrupted());
361	>	}});
362	>
363	>	await(pleaseInterrupt);
364	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.TIMED_WAITING);
365	>	t.interrupt();
366	>	awaitTermination(t);
367		}
368
369	<	public void testTake(){
370	<	try {
371	<	LinkedBlockingQueue q = fullQueue(N);
372	<	for (int i = 0; i < N; ++i) {
373	<	assertEquals(i, ((Integer)q.take()).intValue());
374	<	}
375	<	} catch (InterruptedException e){
319	<	fail("Unexpected exception");
320	<	}
321	<	}
322	<
323	<	public void testTakeFromEmpty() {
324	<	final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
325	<	Thread t = new Thread(new Runnable() {
326	<	public void run(){
327	<	try {
328	<	q.take();
329	<	fail("Should block");
330	<	} catch (InterruptedException success){ }
331	<	}
332	<	});
333	<	try {
334	<	t.start();
335	<	Thread.sleep(SHORT_DELAY_MS);
336	<	t.interrupt();
337	<	t.join();
338	<	} catch (Exception e){
339	<	fail("Unexpected exception");
369	>	/**
370	>	* take retrieves elements in FIFO order
371	>	*/
372	>	public void testTake() throws InterruptedException {
373	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
374	>	for (int i = 0; i < SIZE; ++i) {
375	>	mustEqual(i, q.take());
376		}
377		}
378
379	<	public void testBlockingTake(){
380	<	Thread t = new Thread(new Runnable() {
381	<	public void run() {
382	<	try {
383	<	LinkedBlockingQueue q = fullQueue(N);
384	<	for (int i = 0; i < N; ++i) {
385	<	assertEquals(i, ((Integer)q.take()).intValue());
386	<	}
387	<	q.take();
388	<	fail("take should block");
389	<	} catch (InterruptedException success){
390	<	}
391	<	}});
392	<	t.start();
393	<	try {
394	<	Thread.sleep(SHORT_DELAY_MS);
395	<	t.interrupt();
396	<	t.join();
397	<	}
398	<	catch (InterruptedException ie) {
399	<	fail("Unexpected exception");
400	<	}
379	>	/**
380	>	* Take removes existing elements until empty, then blocks interruptibly
381	>	*/
382	>	public void testBlockingTake() throws InterruptedException {
383	>	final BlockingQueue<Item> q = populatedQueue(SIZE);
384	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
385	>	Thread t = newStartedThread(new CheckedRunnable() {
386	>	public void realRun() throws InterruptedException {
387	>	for (int i = 0; i < SIZE; i++) mustEqual(i, q.take());
388	>
389	>	Thread.currentThread().interrupt();
390	>	try {
391	>	q.take();
392	>	shouldThrow();
393	>	} catch (InterruptedException success) {}
394	>	assertFalse(Thread.interrupted());
395	>
396	>	pleaseInterrupt.countDown();
397	>	try {
398	>	q.take();
399	>	shouldThrow();
400	>	} catch (InterruptedException success) {}
401	>	assertFalse(Thread.interrupted());
402	>	}});
403	>
404	>	await(pleaseInterrupt);
405	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.WAITING);
406	>	t.interrupt();
407	>	awaitTermination(t);
408		}
409
410	+	/**
411	+	* poll succeeds unless empty
412	+	*/
413	+	public void testPoll() {
414	+	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
415	+	for (int i = 0; i < SIZE; ++i) {
416	+	mustEqual(i, q.poll());
417	+	}
418	+	assertNull(q.poll());
419	+	}
420
421	<	public void testPoll(){
422	<	LinkedBlockingQueue q = fullQueue(N);
423	<	for (int i = 0; i < N; ++i) {
424	<	assertEquals(i, ((Integer)q.poll()).intValue());
421	>	/**
422	>	* timed poll with zero timeout succeeds when non-empty, else times out
423	>	*/
424	>	public void testTimedPoll0() throws InterruptedException {
425	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
426	>	for (int i = 0; i < SIZE; ++i) {
427	>	mustEqual(i, q.poll(0, MILLISECONDS));
428		}
429	<	assertNull(q.poll());
429	>	assertNull(q.poll(0, MILLISECONDS));
430		}
431
432	<	public void testTimedPoll0() {
433	<	try {
434	<	LinkedBlockingQueue q = fullQueue(N);
435	<	for (int i = 0; i < N; ++i) {
436	<	assertEquals(i, ((Integer)q.poll(0, TimeUnit.MILLISECONDS)).intValue());
437	<	}
438	<	assertNull(q.poll(0, TimeUnit.MILLISECONDS));
439	<	} catch (InterruptedException e){
440	<	fail("Unexpected exception");
441	<	}
432	>	/**
433	>	* timed poll with nonzero timeout succeeds when non-empty, else times out
434	>	*/
435	>	public void testTimedPoll() throws InterruptedException {
436	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
437	>	for (int i = 0; i < SIZE; ++i) {
438	>	long startTime = System.nanoTime();
439	>	mustEqual(i, q.poll(LONG_DELAY_MS, MILLISECONDS));
440	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
441	>	}
442	>	long startTime = System.nanoTime();
443	>	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
444	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
445	>	checkEmpty(q);
446		}
447
448	<	public void testTimedPoll() {
449	<	try {
450	<	LinkedBlockingQueue q = fullQueue(N);
451	<	for (int i = 0; i < N; ++i) {
452	<	assertEquals(i, ((Integer)q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS)).intValue());
453	<	}
454	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
455	<	} catch (InterruptedException e){
456	<	fail("Unexpected exception");
457	<	}
458	<	}
459	<
460	<	public void testInterruptedTimedPoll(){
461	<	Thread t = new Thread(new Runnable() {
462	<	public void run() {
463	<	try {
464	<	LinkedBlockingQueue q = fullQueue(N);
465	<	for (int i = 0; i < N; ++i) {
466	<	assertEquals(i, ((Integer)q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS)).intValue());
467	<	}
468	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
469	<	} catch (InterruptedException success){
470	<	}
471	<	}});
472	<	t.start();
473	<	try {
474	<	Thread.sleep(SHORT_DELAY_MS);
475	<	t.interrupt();
476	<	t.join();
477	<	}
478	<	catch (InterruptedException ie) {
479	<	fail("Unexpected exception");
420	<	}
448	>	/**
449	>	* Interrupted timed poll throws InterruptedException instead of
450	>	* returning timeout status
451	>	*/
452	>	public void testInterruptedTimedPoll() throws InterruptedException {
453	>	final BlockingQueue<Item> q = populatedQueue(SIZE);
454	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
455	>	Thread t = newStartedThread(new CheckedRunnable() {
456	>	public void realRun() throws InterruptedException {
457	>	for (int i = 0; i < SIZE; i++)
458	>	mustEqual(i, q.poll(LONG_DELAY_MS, MILLISECONDS));
459	>
460	>	Thread.currentThread().interrupt();
461	>	try {
462	>	q.poll(randomTimeout(), randomTimeUnit());
463	>	shouldThrow();
464	>	} catch (InterruptedException success) {}
465	>	assertFalse(Thread.interrupted());
466	>
467	>	pleaseInterrupt.countDown();
468	>	try {
469	>	q.poll(LONGER_DELAY_MS, MILLISECONDS);
470	>	shouldThrow();
471	>	} catch (InterruptedException success) {}
472	>	assertFalse(Thread.interrupted());
473	>	}});
474	>
475	>	await(pleaseInterrupt);
476	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.TIMED_WAITING);
477	>	t.interrupt();
478	>	awaitTermination(t);
479	>	checkEmpty(q);
480		}
481
482	<	public void testTimedPollWithOffer(){
483	<	final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
484	<	Thread t = new Thread(new Runnable() {
485	<	public void run(){
486	<	try {
487	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
488	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
489	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
431	<	fail("Should block");
432	<	} catch (InterruptedException success) { }
433	<	}
434	<	});
435	<	try {
436	<	t.start();
437	<	Thread.sleep(SHORT_DELAY_MS * 2);
438	<	assertTrue(q.offer(new Integer(0), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
439	<	t.interrupt();
440	<	t.join();
441	<	} catch (Exception e){
442	<	fail("Unexpected exception");
443	<	}
444	<	}
445	<
446	<
447	<	public void testPeek(){
448	<	LinkedBlockingQueue q = fullQueue(N);
449	<	for (int i = 0; i < N; ++i) {
450	<	assertEquals(i, ((Integer)q.peek()).intValue());
451	<	q.poll();
482	>	/**
483	>	* peek returns next element, or null if empty
484	>	*/
485	>	public void testPeek() {
486	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
487	>	for (int i = 0; i < SIZE; ++i) {
488	>	mustEqual(i, q.peek());
489	>	mustEqual(i, q.poll());
490		assertTrue(q.peek() == null ||
491	<	i != ((Integer)q.peek()).intValue());
491	>	!q.peek().equals(i));
492		}
493	<	assertNull(q.peek());
493	>	assertNull(q.peek());
494		}
495
496	<	public void testElement(){
497	<	LinkedBlockingQueue q = fullQueue(N);
498	<	for (int i = 0; i < N; ++i) {
499	<	assertEquals(i, ((Integer)q.element()).intValue());
500	<	q.poll();
496	>	/**
497	>	* element returns next element, or throws NSEE if empty
498	>	*/
499	>	public void testElement() {
500	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
501	>	for (int i = 0; i < SIZE; ++i) {
502	>	mustEqual(i, q.element());
503	>	mustEqual(i, q.poll());
504		}
505		try {
506		q.element();
507	<	fail("no such element");
508	<	}
468	<	catch (NoSuchElementException success) {}
507	>	shouldThrow();
508	>	} catch (NoSuchElementException success) {}
509		}
510
511	<	public void testRemove(){
512	<	LinkedBlockingQueue q = fullQueue(N);
513	<	for (int i = 0; i < N; ++i) {
514	<	assertEquals(i, ((Integer)q.remove()).intValue());
511	>	/**
512	>	* remove removes next element, or throws NSEE if empty
513	>	*/
514	>	public void testRemove() {
515	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
516	>	for (int i = 0; i < SIZE; ++i) {
517	>	mustEqual(i, q.remove());
518		}
519		try {
520		q.remove();
521	<	fail("remove should throw");
522	<	} catch (NoSuchElementException success){
480	<	}
521	>	shouldThrow();
522	>	} catch (NoSuchElementException success) {}
523		}
524
525	<	public void testRemoveElement(){
526	<	LinkedBlockingQueue q = fullQueue(N);
527	<	for (int i = 1; i < N; i+=2) {
528	<	assertTrue(q.remove(new Integer(i)));
529	<	}
530	<	for (int i = 0; i < N; i+=2) {
531	<	assertTrue(q.remove(new Integer(i)));
532	<	assertFalse(q.remove(new Integer(i+1)));
533	<	}
534	<	assertTrue(q.isEmpty());
525	>	/**
526	>	* An add following remove(x) succeeds
527	>	*/
528	>	public void testRemoveElementAndAdd() throws InterruptedException {
529	>	LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>();
530	>	assertTrue(q.add(one));
531	>	assertTrue(q.add(two));
532	>	mustRemove(q, one);
533	>	mustRemove(q, two);
534	>	mustAdd(q, three);
535	>	assertNotNull(q.take());
536		}
537	<
538	<	public void testContains(){
539	<	LinkedBlockingQueue q = fullQueue(N);
540	<	for (int i = 0; i < N; ++i) {
541	<	assertTrue(q.contains(new Integer(i)));
537	>
538	>	/**
539	>	* contains(x) reports true when elements added but not yet removed
540	>	*/
541	>	public void testContains() {
542	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
543	>	for (int i = 0; i < SIZE; ++i) {
544	>	mustContain(q, i);
545		q.poll();
546	<	assertFalse(q.contains(new Integer(i)));
546	>	mustNotContain(q, i);
547		}
548		}
549
550	<	public void testClear(){
551	<	LinkedBlockingQueue q = fullQueue(N);
550	>	/**
551	>	* clear removes all elements
552	>	*/
553	>	public void testClear() {
554	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
555		q.clear();
556		assertTrue(q.isEmpty());
557	<	assertEquals(0, q.size());
558	<	assertEquals(N, q.remainingCapacity());
559	<	q.add(new Integer(1));
557	>	mustEqual(0, q.size());
558	>	mustEqual(SIZE, q.remainingCapacity());
559	>	q.add(one);
560		assertFalse(q.isEmpty());
561	+	assertTrue(q.contains(one));
562		q.clear();
563		assertTrue(q.isEmpty());
564		}
565
566	<	public void testContainsAll(){
567	<	LinkedBlockingQueue q = fullQueue(N);
568	<	LinkedBlockingQueue p = new LinkedBlockingQueue(N);
569	<	for (int i = 0; i < N; ++i) {
566	>	/**
567	>	* containsAll(c) is true when c contains a subset of elements
568	>	*/
569	>	public void testContainsAll() {
570	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
571	>	LinkedBlockingQueue<Item> p = new LinkedBlockingQueue<>(SIZE);
572	>	for (int i = 0; i < SIZE; ++i) {
573		assertTrue(q.containsAll(p));
574		assertFalse(p.containsAll(q));
575	<	p.add(new Integer(i));
575	>	mustAdd(p, i);
576		}
577		assertTrue(p.containsAll(q));
578		}
579
580	<	public void testRetainAll(){
581	<	LinkedBlockingQueue q = fullQueue(N);
582	<	LinkedBlockingQueue p = fullQueue(N);
583	<	for (int i = 0; i < N; ++i) {
580	>	/**
581	>	* retainAll(c) retains only those elements of c and reports true if changed
582	>	*/
583	>	public void testRetainAll() {
584	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
585	>	LinkedBlockingQueue<Item> p = populatedQueue(SIZE);
586	>	for (int i = 0; i < SIZE; ++i) {
587		boolean changed = q.retainAll(p);
588		if (i == 0)
589		assertFalse(changed);
#	Line 535 | Line 591 | public class LinkedBlockingQueueTest ext
591		assertTrue(changed);
592
593		assertTrue(q.containsAll(p));
594	<	assertEquals(N-i, q.size());
594	>	mustEqual(SIZE - i, q.size());
595		p.remove();
596		}
597		}
598
599	<	public void testRemoveAll(){
600	<	for (int i = 1; i < N; ++i) {
601	<	LinkedBlockingQueue q = fullQueue(N);
602	<	LinkedBlockingQueue p = fullQueue(i);
599	>	/**
600	>	* removeAll(c) removes only those elements of c and reports true if changed
601	>	*/
602	>	public void testRemoveAll() {
603	>	for (int i = 1; i < SIZE; ++i) {
604	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
605	>	LinkedBlockingQueue<Item> p = populatedQueue(i);
606		assertTrue(q.removeAll(p));
607	<	assertEquals(N-i, q.size());
607	>	mustEqual(SIZE - i, q.size());
608		for (int j = 0; j < i; ++j) {
609	<	Integer I = (Integer)(p.remove());
551	<	assertFalse(q.contains(I));
609	>	mustNotContain(q, p.remove());
610		}
611		}
612		}
613
614	+	/**
615	+	* toArray contains all elements in FIFO order
616	+	*/
617	+	public void testToArray() {
618	+	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
619	+	Object[] a = q.toArray();
620	+	assertSame(Object[].class, a.getClass());
621	+	for (Object o : a)
622	+	assertSame(o, q.poll());
623	+	assertTrue(q.isEmpty());
624	+	}
625
626	<	public void testToArray(){
627	<	LinkedBlockingQueue q = fullQueue(N);
628	<	Object[] o = q.toArray();
629	<	try {
630	<	for(int i = 0; i < o.length; i++)
631	<	assertEquals(o[i], q.take());
632	<	} catch (InterruptedException e){
633	<	fail("Unexpected exception");
634	<	}
635	<	}
636	<
568	<	public void testToArray2(){
569	<	LinkedBlockingQueue q = fullQueue(N);
570	<	Integer[] ints = new Integer[N];
571	<	ints = (Integer[])q.toArray(ints);
572	<	try {
573	<	for(int i = 0; i < ints.length; i++)
574	<	assertEquals(ints[i], q.take());
575	<	} catch (InterruptedException e){
576	<	fail("Unexpected exception");
577	<	}
578	<	}
579	<
580	<	public void testIterator(){
581	<	LinkedBlockingQueue q = fullQueue(N);
582	<	Iterator it = q.iterator();
583	<	try {
584	<	while(it.hasNext()){
585	<	assertEquals(it.next(), q.take());
586	<	}
587	<	} catch (InterruptedException e){
588	<	fail("Unexpected exception");
589	<	}
626	>	/**
627	>	* toArray(a) contains all elements in FIFO order
628	>	*/
629	>	public void testToArray2() throws InterruptedException {
630	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
631	>	Item[] items = new Item[SIZE];
632	>	Item[] array = q.toArray(items);
633	>	assertSame(items, array);
634	>	for (Item o : items)
635	>	assertSame(o, q.poll());
636	>	assertTrue(q.isEmpty());
637		}
638
639	<	public void testIteratorOrdering() {
639	>	/**
640	>	* toArray(incompatible array type) throws ArrayStoreException
641	>	*/
642	>	@SuppressWarnings("CollectionToArraySafeParameter")
643	>	public void testToArray_incompatibleArrayType() {
644	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
645	>	try {
646	>	q.toArray(new String[10]);
647	>	shouldThrow();
648	>	} catch (ArrayStoreException success) {}
649	>	}
650
651	<	final LinkedBlockingQueue q = new LinkedBlockingQueue(3);
651	>	/**
652	>	* iterator iterates through all elements
653	>	*/
654	>	public void testIterator() throws InterruptedException {
655	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
656	>	Iterator<? extends Item> it = q.iterator();
657	>	int i;
658	>	for (i = 0; it.hasNext(); i++)
659	>	mustContain(q, it.next());
660	>	mustEqual(i, SIZE);
661	>	assertIteratorExhausted(it);
662	>
663	>	it = q.iterator();
664	>	for (i = 0; it.hasNext(); i++)
665	>	mustEqual(it.next(), q.take());
666	>	mustEqual(i, SIZE);
667	>	assertIteratorExhausted(it);
668	>	}
669
670	<	q.add(new Integer(1));
671	<	q.add(new Integer(2));
672	<	q.add(new Integer(3));
670	>	/**
671	>	* iterator of empty collection has no elements
672	>	*/
673	>	public void testEmptyIterator() {
674	>	assertIteratorExhausted(new LinkedBlockingQueue<Item>().iterator());
675	>	}
676
677	<	assertEquals("queue should be full", 0, q.remainingCapacity());
677	>	/**
678	>	* iterator.remove removes current element
679	>	*/
680	>	public void testIteratorRemove() {
681	>	final LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(3);
682	>	q.add(two);
683	>	q.add(one);
684	>	q.add(three);
685	>
686	>	Iterator<? extends Item> it = q.iterator();
687	>	it.next();
688	>	it.remove();
689	>
690	>	it = q.iterator();
691	>	assertSame(it.next(), one);
692	>	assertSame(it.next(), three);
693	>	assertFalse(it.hasNext());
694	>	}
695
696	+	/**
697	+	* iterator ordering is FIFO
698	+	*/
699	+	public void testIteratorOrdering() {
700	+	final LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(3);
701	+	q.add(one);
702	+	q.add(two);
703	+	q.add(three);
704	+	mustEqual(0, q.remainingCapacity());
705		int k = 0;
706	<	for (Iterator it = q.iterator(); it.hasNext();) {
707	<	int i = ((Integer)(it.next())).intValue();
605	<	assertEquals("items should come out in order", ++k, i);
706	>	for (Iterator<? extends Item> it = q.iterator(); it.hasNext();) {
707	>	mustEqual(++k, it.next());
708		}
709	<
608	<	assertEquals("should go through 3 elements", 3, k);
709	>	mustEqual(3, k);
710		}
711
712	<	public void testWeaklyConsistentIteration () {
713	<
714	<	final LinkedBlockingQueue q = new LinkedBlockingQueue(3);
715	<
716	<	q.add(new Integer(1));
717	<	q.add(new Integer(2));
718	<	q.add(new Integer(3));
719	<
720	<	try {
721	<	for (Iterator it = q.iterator(); it.hasNext();) {
722	<	q.remove();
622	<	it.next();
623	<	}
624	<	}
625	<	catch (ConcurrentModificationException e) {
626	<	fail("weakly consistent iterator; should not get CME");
712	>	/**
713	>	* Modifications do not cause iterators to fail
714	>	*/
715	>	public void testWeaklyConsistentIteration() {
716	>	final LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(3);
717	>	q.add(one);
718	>	q.add(two);
719	>	q.add(three);
720	>	for (Iterator<? extends Item> it = q.iterator(); it.hasNext();) {
721	>	q.remove();
722	>	it.next();
723		}
724	<
629	<	assertEquals("queue should be empty again", 0, q.size());
724	>	mustEqual(0, q.size());
725		}
726
727	<
728	<	public void testToString(){
729	<	LinkedBlockingQueue q = fullQueue(N);
727	>	/**
728	>	* toString contains toStrings of elements
729	>	*/
730	>	public void testToString() {
731	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
732		String s = q.toString();
733	<	for (int i = 0; i < N; ++i) {
734	<	assertTrue(s.indexOf(String.valueOf(i)) >= 0);
733	>	for (int i = 0; i < SIZE; ++i) {
734	>	assertTrue(s.contains(String.valueOf(i)));
735		}
736	<	}
640	<
736	>	}
737
738	+	/**
739	+	* offer transfers elements across Executor tasks
740	+	*/
741		public void testOfferInExecutor() {
742	+	final LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(2);
743	+	q.add(one);
744	+	q.add(two);
745	+	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
746	+	final ExecutorService executor = Executors.newFixedThreadPool(2);
747	+	try (PoolCleaner cleaner = cleaner(executor)) {
748	+	executor.execute(new CheckedRunnable() {
749	+	public void realRun() throws InterruptedException {
750	+	assertFalse(q.offer(three));
751	+	threadsStarted.await();
752	+	assertTrue(q.offer(three, LONG_DELAY_MS, MILLISECONDS));
753	+	mustEqual(0, q.remainingCapacity());
754	+	}});
755
756	<	final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
757	<
758	<	q.add(new Integer(1));
759	<	q.add(new Integer(2));
760	<
761	<	ExecutorService executor = Executors.newFixedThreadPool(2);
650	<
651	<	executor.execute(new Runnable() {
652	<	public void run() {
653	<	assertFalse("offer should be rejected", q.offer(new Integer(3)));
654	<	try {
655	<	assertTrue("offer should be accepted", q.offer(new Integer(3), MEDIUM_DELAY_MS * 2, TimeUnit.MILLISECONDS));
656	<	assertEquals(0, q.remainingCapacity());
657	<	}
658	<	catch (InterruptedException e) {
659	<	fail("should not be interrupted");
660	<	}
661	<	}
662	<	});
663	<
664	<	executor.execute(new Runnable() {
665	<	public void run() {
666	<	try {
667	<	Thread.sleep(MEDIUM_DELAY_MS);
668	<	assertEquals("first item in queue should be 1", new Integer(1), q.take());
669	<	}
670	<	catch (InterruptedException e) {
671	<	fail("should not be interrupted");
672	<	}
673	<	}
674	<	});
675	<
676	<	executor.shutdown();
677	<
756	>	executor.execute(new CheckedRunnable() {
757	>	public void realRun() throws InterruptedException {
758	>	threadsStarted.await();
759	>	assertSame(one, q.take());
760	>	}});
761	>	}
762		}
763
764	+	/**
765	+	* timed poll retrieves elements across Executor threads
766	+	*/
767		public void testPollInExecutor() {
768	+	final LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(2);
769	+	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
770	+	final ExecutorService executor = Executors.newFixedThreadPool(2);
771	+	try (PoolCleaner cleaner = cleaner(executor)) {
772	+	executor.execute(new CheckedRunnable() {
773	+	public void realRun() throws InterruptedException {
774	+	assertNull(q.poll());
775	+	threadsStarted.await();
776	+	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
777	+	checkEmpty(q);
778	+	}});
779
780	<	final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
780	>	executor.execute(new CheckedRunnable() {
781	>	public void realRun() throws InterruptedException {
782	>	threadsStarted.await();
783	>	q.put(one);
784	>	}});
785	>	}
786	>	}
787
788	<	ExecutorService executor = Executors.newFixedThreadPool(2);
788	>	/**
789	>	* A deserialized/reserialized queue has same elements in same order
790	>	*/
791	>	public void testSerialization() throws Exception {
792	>	Queue<Item> x = populatedQueue(SIZE);
793	>	Queue<Item> y = serialClone(x);
794	>
795	>	assertNotSame(x, y);
796	>	mustEqual(x.size(), y.size());
797	>	mustEqual(x.toString(), y.toString());
798	>	assertTrue(Arrays.equals(x.toArray(), y.toArray()));
799	>	while (!x.isEmpty()) {
800	>	assertFalse(y.isEmpty());
801	>	mustEqual(x.remove(), y.remove());
802	>	}
803	>	assertTrue(y.isEmpty());
804	>	}
805
806	<	executor.execute(new Runnable() {
807	<	public void run() {
808	<	assertNull("poll should fail", q.poll());
809	<	try {
810	<	assertTrue(null != q.poll(MEDIUM_DELAY_MS * 2, TimeUnit.MILLISECONDS));
811	<	assertTrue(q.isEmpty());
812	<	}
813	<	catch (InterruptedException e) {
814	<	fail("should not be interrupted");
815	<	}
816	<	}
817	<	});
806	>	/**
807	>	* drainTo(c) empties queue into another collection c
808	>	*/
809	>	public void testDrainTo() {
810	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
811	>	ArrayList<Item> l = new ArrayList<>();
812	>	q.drainTo(l);
813	>	mustEqual(0, q.size());
814	>	mustEqual(SIZE, l.size());
815	>	for (int i = 0; i < SIZE; ++i)
816	>	mustEqual(l.get(i), i);
817	>	q.add(zero);
818	>	q.add(one);
819	>	assertFalse(q.isEmpty());
820	>	mustContain(q, zero);
821	>	mustContain(q, one);
822	>	l.clear();
823	>	q.drainTo(l);
824	>	mustEqual(0, q.size());
825	>	mustEqual(2, l.size());
826	>	for (int i = 0; i < 2; ++i)
827	>	mustEqual(l.get(i), i);
828	>	}
829
830	<	executor.execute(new Runnable() {
831	<	public void run() {
832	<	try {
833	<	Thread.sleep(MEDIUM_DELAY_MS);
834	<	q.put(new Integer(1));
835	<	}
836	<	catch (InterruptedException e) {
837	<	fail("should not be interrupted");
838	<	}
839	<	}
840	<	});
841	<
842	<	executor.shutdown();
830	>	/**
831	>	* drainTo empties full queue, unblocking a waiting put.
832	>	*/
833	>	public void testDrainToWithActivePut() throws InterruptedException {
834	>	final LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
835	>	Thread t = new Thread(new CheckedRunnable() {
836	>	public void realRun() throws InterruptedException {
837	>	q.put(new Item(SIZE + 1));
838	>	}});
839	>
840	>	t.start();
841	>	ArrayList<Item> l = new ArrayList<>();
842	>	q.drainTo(l);
843	>	assertTrue(l.size() >= SIZE);
844	>	for (int i = 0; i < SIZE; ++i)
845	>	mustEqual(l.get(i), i);
846	>	t.join();
847	>	assertTrue(q.size() + l.size() >= SIZE);
848	>	}
849
850	+	/**
851	+	* drainTo(c, n) empties first min(n, size) elements of queue into c
852	+	*/
853	+	public void testDrainToN() {
854	+	LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>();
855	+	for (int i = 0; i < SIZE + 2; ++i) {
856	+	for (int j = 0; j < SIZE; j++)
857	+	mustOffer(q, j);
858	+	ArrayList<Item> l = new ArrayList<>();
859	+	q.drainTo(l, i);
860	+	int k = (i < SIZE) ? i : SIZE;
861	+	mustEqual(k, l.size());
862	+	mustEqual(SIZE - k, q.size());
863	+	for (int j = 0; j < k; ++j)
864	+	mustEqual(l.get(j), j);
865	+	do {} while (q.poll() != null);
866	+	}
867		}
868
869	<	public void testSerialization() {
870	<	LinkedBlockingQueue q = fullQueue(N);
871	<
872	<	try {
873	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
874	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
875	<	out.writeObject(q);
876	<	out.close();
877	<
878	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
879	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
880	<	LinkedBlockingQueue r = (LinkedBlockingQueue)in.readObject();
727	<	assertEquals(q.size(), r.size());
728	<	while (!q.isEmpty())
729	<	assertEquals(q.remove(), r.remove());
730	<	} catch(Exception e){
731	<	e.printStackTrace();
732	<	fail("unexpected exception");
869	>	/**
870	>	* remove(null), contains(null) always return false
871	>	*/
872	>	public void testNeverContainsNull() {
873	>	Collection<?>[] qs = {
874	>	new LinkedBlockingQueue<>(),
875	>	populatedQueue(2),
876	>	};
877	>
878	>	for (Collection<?> q : qs) {
879	>	assertFalse(q.contains(null));
880	>	assertFalse(q.remove(null));
881		}
882		}
883

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