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

Comparing jsr166/src/test/tck/SynchronousQueueTest.java (file contents):
Revision 1.4 by dl, Sat Sep 20 18:20:08 2003 UTC vs.
Revision 1.69 by jsr166, Wed Jan 27 01:57:24 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.*;
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.concurrent.BlockingQueue;
17	>	import java.util.concurrent.CountDownLatch;
18	>	import java.util.concurrent.Executors;
19	>	import java.util.concurrent.ExecutorService;
20	>	import java.util.concurrent.SynchronousQueue;
21	>
22	>	import junit.framework.Test;
23
24		public class SynchronousQueueTest extends JSR166TestCase {
25
26	<	public static void main(String[] args) {
27	<	junit.textui.TestRunner.run (suite());
26	>	public static class Fair extends BlockingQueueTest {
27	>	protected BlockingQueue emptyCollection() {
28	>	return new SynchronousQueue(true);
29	>	}
30		}
31
32	<	public static Test suite() {
33	<	return new TestSuite(SynchronousQueueTest.class);
32	>	public static class NonFair extends BlockingQueueTest {
33	>	protected BlockingQueue emptyCollection() {
34	>	return new SynchronousQueue(false);
35	>	}
36		}
37
38	<	/**
39	<	*
25	<	*/
26	<	public void testEmptyFull() {
27	<	SynchronousQueue q = new SynchronousQueue();
28	<	assertTrue(q.isEmpty());
29	<	assertEquals(0, q.size());
30	<	assertEquals(0, q.remainingCapacity());
31	<	assertFalse(q.offer(new Integer(3)));
38	>	public static void main(String[] args) {
39	>	main(suite(), args);
40		}
41
42	<	/**
43	<	*
44	<	*/
45	<	public void testOfferNull() {
38	<	try {
39	<	SynchronousQueue q = new SynchronousQueue();
40	<	q.offer(null);
41	<	shouldThrow();
42	<	} catch (NullPointerException success) { }
42	>	public static Test suite() {
43	>	return newTestSuite(SynchronousQueueTest.class,
44	>	new Fair().testSuite(),
45	>	new NonFair().testSuite());
46		}
47
48		/**
49	<	*
49	>	* Any SynchronousQueue is both empty and full
50		*/
51	<	public void testOffer() {
52	<	SynchronousQueue q = new SynchronousQueue();
53	<	assertFalse(q.offer(new Integer(1)));
51	>	public void testEmptyFull()      { testEmptyFull(false); }
52	>	public void testEmptyFull_fair() { testEmptyFull(true); }
53	>	public void testEmptyFull(boolean fair) {
54	>	final SynchronousQueue<Item> q = new SynchronousQueue<>(fair);
55	>	assertTrue(q.isEmpty());
56	>	mustEqual(0, q.size());
57	>	mustEqual(0, q.remainingCapacity());
58	>	assertFalse(q.offer(zero));
59		}
60
61		/**
62	<	*
62	>	* offer fails if no active taker
63		*/
64	<	public void testAdd() {
65	<	try {
66	<	SynchronousQueue q = new SynchronousQueue();
67	<	assertEquals(0, q.remainingCapacity());
68	<	q.add(new Integer(0));
61	<	} catch (IllegalStateException success){
62	<	}
64	>	public void testOffer()      { testOffer(false); }
65	>	public void testOffer_fair() { testOffer(true); }
66	>	public void testOffer(boolean fair) {
67	>	SynchronousQueue<Item> q = new SynchronousQueue<>(fair);
68	>	assertFalse(q.offer(one));
69		}
70
71		/**
72	<	*
72	>	* add throws IllegalStateException if no active taker
73		*/
74	<	public void testAddAll1() {
74	>	public void testAdd()      { testAdd(false); }
75	>	public void testAdd_fair() { testAdd(true); }
76	>	public void testAdd(boolean fair) {
77	>	SynchronousQueue<Item> q = new SynchronousQueue<>(fair);
78	>	mustEqual(0, q.remainingCapacity());
79		try {
80	<	SynchronousQueue q = new SynchronousQueue();
71	<	q.addAll(null);
80	>	q.add(one);
81		shouldThrow();
82	<	}
74	<	catch (NullPointerException success) {}
82	>	} catch (IllegalStateException success) {}
83		}
84	+
85		/**
86	<	*
86	>	* addAll(this) throws IllegalArgumentException
87		*/
88	<	public void testAddAll2() {
88	>	public void testAddAll_self()      { testAddAll_self(false); }
89	>	public void testAddAll_self_fair() { testAddAll_self(true); }
90	>	public void testAddAll_self(boolean fair) {
91	>	SynchronousQueue<Item> q = new SynchronousQueue<>(fair);
92		try {
93	<	SynchronousQueue q = new SynchronousQueue();
82	<	Integer[] ints = new Integer[1];
83	<	q.addAll(Arrays.asList(ints));
93	>	q.addAll(q);
94		shouldThrow();
95	<	}
86	<	catch (NullPointerException success) {}
95	>	} catch (IllegalArgumentException success) {}
96		}
97	<	/**
98	<	*
97	>
98	>	/**S
99	>	* addAll throws IllegalStateException if no active taker
100		*/
101	<	public void testAddAll4() {
101	>	public void testAddAll_ISE()      { testAddAll_ISE(false); }
102	>	public void testAddAll_ISE_fair() { testAddAll_ISE(true); }
103	>	public void testAddAll_ISE(boolean fair) {
104	>	SynchronousQueue<Item> q = new SynchronousQueue<>(fair);
105	>	Item[] items = seqItems(1);
106	>	Collection<Item> coll = Arrays.asList(items);
107		try {
108	<	SynchronousQueue q = new SynchronousQueue();
94	<	Integer[] ints = new Integer[1];
95	<	for (int i = 0; i < 1; ++i)
96	<	ints[i] = new Integer(i);
97	<	q.addAll(Arrays.asList(ints));
108	>	q.addAll(coll);
109		shouldThrow();
110	<	}
100	<	catch (IllegalStateException success) {}
110	>	} catch (IllegalStateException success) {}
111		}
112
113		/**
114	<	*
114	>	* put blocks interruptibly if no active taker
115		*/
116	<	public void testPutNull() {
117	<	try {
118	<	SynchronousQueue q = new SynchronousQueue();
119	<	q.put(null);
120	<	shouldThrow();
121	<	}
122	<	catch (NullPointerException success){
123	<	}
124	<	catch (InterruptedException ie) {
125	<	unexpectedException();
126	<	}
127	<	}
116	>	public void testBlockingPut()      { testBlockingPut(false); }
117	>	public void testBlockingPut_fair() { testBlockingPut(true); }
118	>	public void testBlockingPut(boolean fair) {
119	>	final SynchronousQueue<Item> q = new SynchronousQueue<>(fair);
120	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
121	>	Thread t = newStartedThread(new CheckedRunnable() {
122	>	public void realRun() throws InterruptedException {
123	>	Thread.currentThread().interrupt();
124	>	try {
125	>	q.put(ninetynine);
126	>	shouldThrow();
127	>	} catch (InterruptedException success) {}
128	>	assertFalse(Thread.interrupted());
129
130	<	/**
131	<	*
132	<	*/
133	<	public void testBlockingPut() {
134	<	Thread t = new Thread(new Runnable() {
135	<	public void run() {
136	<	try {
137	<	SynchronousQueue q = new SynchronousQueue();
138	<	q.put(new Integer(0));
139	<	threadShouldThrow();
140	<	} catch (InterruptedException ie){
141	<	}
142	<	}});
132	<	t.start();
133	<	try {
134	<	Thread.sleep(SHORT_DELAY_MS);
135	<	t.interrupt();
136	<	t.join();
137	<	}
138	<	catch (InterruptedException ie) {
139	<	unexpectedException();
140	<	}
130	>	pleaseInterrupt.countDown();
131	>	try {
132	>	q.put(ninetynine);
133	>	shouldThrow();
134	>	} catch (InterruptedException success) {}
135	>	assertFalse(Thread.interrupted());
136	>	}});
137	>
138	>	await(pleaseInterrupt);
139	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.WAITING);
140	>	t.interrupt();
141	>	awaitTermination(t);
142	>	mustEqual(0, q.remainingCapacity());
143		}
144
145		/**
146	<	*
147	<	*/
148	<	public void testPutWithTake() {
149	<	final SynchronousQueue q = new SynchronousQueue();
150	<	Thread t = new Thread(new Runnable() {
151	<	public void run() {
152	<	int added = 0;
153	<	try {
154	<	q.put(new Object());
155	<	++added;
156	<	q.put(new Object());
157	<	++added;
158	<	q.put(new Object());
159	<	++added;
160	<	q.put(new Object());
161	<	++added;
162	<	threadShouldThrow();
163	<	} catch (InterruptedException e){
164	<	assertTrue(added >= 1);
165	<	}
166	<	}
167	<	});
168	<	try {
169	<	t.start();
170	<	Thread.sleep(SHORT_DELAY_MS);
171	<	q.take();
172	<	Thread.sleep(SHORT_DELAY_MS);
173	<	t.interrupt();
174	<	t.join();
175	<	} catch (Exception e){
176	<	unexpectedException();
177	<	}
146	>	* put blocks interruptibly waiting for take
147	>	*/
148	>	public void testPutWithTake()      { testPutWithTake(false); }
149	>	public void testPutWithTake_fair() { testPutWithTake(true); }
150	>	public void testPutWithTake(boolean fair) {
151	>	final SynchronousQueue<Item> q = new SynchronousQueue<>(fair);
152	>	final CountDownLatch pleaseTake = new CountDownLatch(1);
153	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
154	>	Thread t = newStartedThread(new CheckedRunnable() {
155	>	public void realRun() throws InterruptedException {
156	>	pleaseTake.countDown();
157	>	q.put(one);
158	>
159	>	Thread.currentThread().interrupt();
160	>	try {
161	>	q.put(ninetynine);
162	>	shouldThrow();
163	>	} catch (InterruptedException success) {}
164	>	assertFalse(Thread.interrupted());
165	>
166	>	pleaseInterrupt.countDown();
167	>	try {
168	>	q.put(ninetynine);
169	>	shouldThrow();
170	>	} catch (InterruptedException success) {}
171	>	assertFalse(Thread.interrupted());
172	>	}});
173	>
174	>	await(pleaseTake);
175	>	mustEqual(0, q.remainingCapacity());
176	>	try { assertSame(one, q.take()); }
177	>	catch (InterruptedException e) { threadUnexpectedException(e); }
178	>
179	>	await(pleaseInterrupt);
180	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.WAITING);
181	>	t.interrupt();
182	>	awaitTermination(t);
183	>	mustEqual(0, q.remainingCapacity());
184		}
185
186		/**
187	<	*
187	>	* timed offer times out if elements not taken
188		*/
189		public void testTimedOffer() {
190	<	final SynchronousQueue q = new SynchronousQueue();
191	<	Thread t = new Thread(new Runnable() {
192	<	public void run() {
193	<	try {
194	<
195	<	threadAssertFalse(q.offer(new Object(), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
188	<	q.offer(new Object(), LONG_DELAY_MS, TimeUnit.MILLISECONDS);
189	<	threadShouldThrow();
190	<	} catch (InterruptedException success){}
191	<	}
192	<	});
193	<
194	<	try {
195	<	t.start();
196	<	Thread.sleep(SMALL_DELAY_MS);
197	<	t.interrupt();
198	<	t.join();
199	<	} catch (Exception e){
200	<	unexpectedException();
201	<	}
202	<	}
190	>	final boolean fair = randomBoolean();
191	>	final SynchronousQueue<Item> q = new SynchronousQueue<>(fair);
192	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
193	>	Thread t = newStartedThread(new CheckedRunnable() {
194	>	public void realRun() throws InterruptedException {
195	>	long startTime = System.nanoTime();
196
197	+	assertFalse(q.offer(zero, timeoutMillis(), MILLISECONDS));
198	+	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
199
200	<	/**
201	<	*
202	<	*/
203	<	public void testTakeFromEmpty() {
204	<	final SynchronousQueue q = new SynchronousQueue();
205	<	Thread t = new Thread(new Runnable() {
206	<	public void run() {
207	<	try {
208	<	q.take();
209	<	threadShouldThrow();
210	<	} catch (InterruptedException success){ }
211	<	}
212	<	});
213	<	try {
214	<	t.start();
215	<	Thread.sleep(SHORT_DELAY_MS);
216	<	t.interrupt();
217	<	t.join();
218	<	} catch (Exception e){
224	<	unexpectedException();
225	<	}
200	>	Thread.currentThread().interrupt();
201	>	try {
202	>	q.offer(one, randomTimeout(), randomTimeUnit());
203	>	shouldThrow();
204	>	} catch (InterruptedException success) {}
205	>	assertFalse(Thread.interrupted());
206	>
207	>	pleaseInterrupt.countDown();
208	>	try {
209	>	q.offer(two, LONGER_DELAY_MS, MILLISECONDS);
210	>	shouldThrow();
211	>	} catch (InterruptedException success) {}
212	>	assertFalse(Thread.interrupted());
213	>	}});
214	>
215	>	await(pleaseInterrupt);
216	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.TIMED_WAITING);
217	>	t.interrupt();
218	>	awaitTermination(t);
219		}
220
221		/**
222	<	*
222	>	* poll return null if no active putter
223		*/
224	<	public void testPoll() {
225	<	SynchronousQueue q = new SynchronousQueue();
226	<	assertNull(q.poll());
224	>	public void testPoll()      { testPoll(false); }
225	>	public void testPoll_fair() { testPoll(true); }
226	>	public void testPoll(boolean fair) {
227	>	final SynchronousQueue<Item> q = new SynchronousQueue<>(fair);
228	>	assertNull(q.poll());
229		}
230
231		/**
232	<	*
232	>	* timed poll with zero timeout times out if no active putter
233		*/
234	<	public void testTimedPoll0() {
235	<	try {
236	<	SynchronousQueue q = new SynchronousQueue();
237	<	assertNull(q.poll(0, TimeUnit.MILLISECONDS));
238	<	} catch (InterruptedException e){
239	<	unexpectedException();
245	<	}
234	>	public void testTimedPoll0()      { testTimedPoll0(false); }
235	>	public void testTimedPoll0_fair() { testTimedPoll0(true); }
236	>	public void testTimedPoll0(boolean fair) {
237	>	final SynchronousQueue<Item> q = new SynchronousQueue<>(fair);
238	>	try { assertNull(q.poll(0, MILLISECONDS)); }
239	>	catch (InterruptedException e) { threadUnexpectedException(e); }
240		}
241
242		/**
243	<	*
243	>	* timed poll with nonzero timeout times out if no active putter
244		*/
245		public void testTimedPoll() {
246	<	try {
247	<	SynchronousQueue q = new SynchronousQueue();
248	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
249	<	} catch (InterruptedException e){
250	<	unexpectedException();
251	<	}
246	>	final boolean fair = randomBoolean();
247	>	final SynchronousQueue<Item> q = new SynchronousQueue<>(fair);
248	>	final long startTime = System.nanoTime();
249	>	try { assertNull(q.poll(timeoutMillis(), MILLISECONDS)); }
250	>	catch (InterruptedException e) { threadUnexpectedException(e); }
251	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
252		}
253
254		/**
255	<	*
256	<	*/
263	<	public void testInterruptedTimedPoll() {
264	<	Thread t = new Thread(new Runnable() {
265	<	public void run() {
266	<	try {
267	<	SynchronousQueue q = new SynchronousQueue();
268	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
269	<	} catch (InterruptedException success){
270	<	}
271	<	}});
272	<	t.start();
273	<	try {
274	<	Thread.sleep(SHORT_DELAY_MS);
275	<	t.interrupt();
276	<	t.join();
277	<	}
278	<	catch (InterruptedException ie) {
279	<	unexpectedException();
280	<	}
281	<	}
282	<
283	<	/**
284	<	*
255	>	* timed poll before a delayed offer times out, returning null;
256	>	* after offer succeeds; on interruption throws
257		*/
258		public void testTimedPollWithOffer() {
259	<	final SynchronousQueue q = new SynchronousQueue();
260	<	Thread t = new Thread(new Runnable() {
261	<	public void run() {
262	<	try {
263	<	threadAssertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
264	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
265	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
266	<	threadShouldThrow();
267	<	} catch (InterruptedException success) { }
268	<	}
269	<	});
270	<	try {
271	<	t.start();
272	<	Thread.sleep(SMALL_DELAY_MS);
273	<	assertTrue(q.offer(new Integer(0), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
274	<	t.interrupt();
275	<	t.join();
276	<	} catch (Exception e){
277	<	unexpectedException();
278	<	}
279	<	}
259	>	final boolean fair = randomBoolean();
260	>	final SynchronousQueue<Item> q = new SynchronousQueue<>(fair);
261	>	final CountDownLatch pleaseOffer = new CountDownLatch(1);
262	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
263	>	Thread t = newStartedThread(new CheckedRunnable() {
264	>	public void realRun() throws InterruptedException {
265	>	long startTime = System.nanoTime();
266	>	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
267	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
268	>
269	>	pleaseOffer.countDown();
270	>	startTime = System.nanoTime();
271	>	assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS));
272	>
273	>	Thread.currentThread().interrupt();
274	>	try {
275	>	q.poll(randomTimeout(), randomTimeUnit());
276	>	shouldThrow();
277	>	} catch (InterruptedException success) {}
278	>	assertFalse(Thread.interrupted());
279	>
280	>	pleaseInterrupt.countDown();
281	>	try {
282	>	q.poll(LONG_DELAY_MS, MILLISECONDS);
283	>	shouldThrow();
284	>	} catch (InterruptedException success) {}
285	>	assertFalse(Thread.interrupted());
286	>
287	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
288	>	}});
289
290	+	await(pleaseOffer);
291	+	long startTime = System.nanoTime();
292	+	try { assertTrue(q.offer(zero, LONG_DELAY_MS, MILLISECONDS)); }
293	+	catch (InterruptedException e) { threadUnexpectedException(e); }
294	+	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
295	+
296	+	await(pleaseInterrupt);
297	+	if (randomBoolean()) assertThreadBlocks(t, Thread.State.TIMED_WAITING);
298	+	t.interrupt();
299	+	awaitTermination(t);
300	+	}
301
302		/**
303	<	*
303	>	* peek() returns null if no active putter
304		*/
305	<	public void testPeek() {
306	<	SynchronousQueue q = new SynchronousQueue();
307	<	assertNull(q.peek());
305	>	public void testPeek()      { testPeek(false); }
306	>	public void testPeek_fair() { testPeek(true); }
307	>	public void testPeek(boolean fair) {
308	>	final SynchronousQueue<Item> q = new SynchronousQueue<>(fair);
309	>	assertNull(q.peek());
310		}
311
312		/**
313	<	*
313	>	* element() throws NoSuchElementException if no active putter
314		*/
315	<	public void testElement() {
316	<	SynchronousQueue q = new SynchronousQueue();
315	>	public void testElement()      { testElement(false); }
316	>	public void testElement_fair() { testElement(true); }
317	>	public void testElement(boolean fair) {
318	>	final SynchronousQueue<Item> q = new SynchronousQueue<>(fair);
319		try {
320		q.element();
321		shouldThrow();
322	<	}
327	<	catch (NoSuchElementException success) {}
322	>	} catch (NoSuchElementException success) {}
323		}
324
325		/**
326	<	*
326	>	* remove() throws NoSuchElementException if no active putter
327		*/
328	<	public void testRemove() {
329	<	SynchronousQueue q = new SynchronousQueue();
328	>	public void testRemove()      { testRemove(false); }
329	>	public void testRemove_fair() { testRemove(true); }
330	>	public void testRemove(boolean fair) {
331	>	final SynchronousQueue<Item> q = new SynchronousQueue<>(fair);
332		try {
333		q.remove();
334		shouldThrow();
335	<	} catch (NoSuchElementException success){
339	<	}
335	>	} catch (NoSuchElementException success) {}
336		}
337
338		/**
339	<	*
344	<	*/
345	<	public void testRemoveElement() {
346	<	SynchronousQueue q = new SynchronousQueue();
347	<	assertFalse(q.remove(new Integer(0)));
348	<	assertTrue(q.isEmpty());
349	<	}
350	<
351	<	/**
352	<	*
339	>	* contains returns false
340		*/
341	<	public void testContains() {
342	<	SynchronousQueue q = new SynchronousQueue();
343	<	assertFalse(q.contains(new Integer(0)));
341	>	public void testContains()      { testContains(false); }
342	>	public void testContains_fair() { testContains(true); }
343	>	public void testContains(boolean fair) {
344	>	final SynchronousQueue<Item> q = new SynchronousQueue<>(fair);
345	>	assertFalse(q.contains(zero));
346		}
347
348		/**
349	<	*
349	>	* clear ensures isEmpty
350		*/
351	<	public void testClear() {
352	<	SynchronousQueue q = new SynchronousQueue();
351	>	public void testClear()      { testClear(false); }
352	>	public void testClear_fair() { testClear(true); }
353	>	public void testClear(boolean fair) {
354	>	final SynchronousQueue<Item> q = new SynchronousQueue<>(fair);
355		q.clear();
356		assertTrue(q.isEmpty());
357		}
358
359		/**
360	<	*
360	>	* containsAll returns false unless empty
361		*/
362	<	public void testContainsAll() {
363	<	SynchronousQueue q = new SynchronousQueue();
364	<	Integer[] empty = new Integer[0];
365	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
366	<	assertFalse(q.containsAll(Arrays.asList(ints)));
362	>	public void testContainsAll()      { testContainsAll(false); }
363	>	public void testContainsAll_fair() { testContainsAll(true); }
364	>	public void testContainsAll(boolean fair) {
365	>	final SynchronousQueue<Item> q = new SynchronousQueue<>(fair);
366	>	Item[] empty = new Item[0];
367	>	assertTrue(q.containsAll(Arrays.asList(empty)));
368	>	Item[] items = new Item[1]; items[0] = zero;
369	>	assertFalse(q.containsAll(Arrays.asList(items)));
370		}
371
372		/**
373	<	*
373	>	* retainAll returns false
374		*/
375	<	public void testRetainAll() {
376	<	SynchronousQueue q = new SynchronousQueue();
377	<	Integer[] empty = new Integer[0];
378	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
379	<	q.retainAll(Arrays.asList(ints));
380	<	assertFalse(q.containsAll(Arrays.asList(ints)));
375	>	public void testRetainAll()      { testRetainAll(false); }
376	>	public void testRetainAll_fair() { testRetainAll(true); }
377	>	public void testRetainAll(boolean fair) {
378	>	final SynchronousQueue<Item> q = new SynchronousQueue<>(fair);
379	>	Item[] empty = new Item[0];
380	>	assertFalse(q.retainAll(Arrays.asList(empty)));
381	>	Item[] items = new Item[1]; items[0] = zero;
382	>	assertFalse(q.retainAll(Arrays.asList(items)));
383		}
384
385		/**
386	<	*
386	>	* removeAll returns false
387		*/
388	<	public void testRemoveAll() {
389	<	SynchronousQueue q = new SynchronousQueue();
390	<	Integer[] empty = new Integer[0];
391	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
392	<	q.removeAll(Arrays.asList(ints));
393	<	assertFalse(q.containsAll(Arrays.asList(ints)));
388	>	public void testRemoveAll()      { testRemoveAll(false); }
389	>	public void testRemoveAll_fair() { testRemoveAll(true); }
390	>	public void testRemoveAll(boolean fair) {
391	>	final SynchronousQueue<Item> q = new SynchronousQueue<>(fair);
392	>	Item[] empty = new Item[0];
393	>	assertFalse(q.removeAll(Arrays.asList(empty)));
394	>	Item[] items = new Item[1]; items[0] = zero;
395	>	assertFalse(q.containsAll(Arrays.asList(items)));
396		}
397
400	–
398		/**
399	<	*
399	>	* toArray is empty
400		*/
401	<	public void testToArray() {
402	<	SynchronousQueue q = new SynchronousQueue();
403	<	Object[] o = q.toArray();
404	<	assertEquals(o.length, 0);
401	>	public void testToArray()      { testToArray(false); }
402	>	public void testToArray_fair() { testToArray(true); }
403	>	public void testToArray(boolean fair) {
404	>	final SynchronousQueue<Item> q = new SynchronousQueue<>(fair);
405	>	Object[] o = q.toArray();
406	>	mustEqual(0, o.length);
407		}
408
409		/**
410	<	*
410	>	* toArray(Item array) returns its argument with the first
411	>	* element (if present) nulled out
412		*/
413	<	public void testToArray2() {
414	<	SynchronousQueue q = new SynchronousQueue();
415	<	Integer[] ints = new Integer[1];
416	<	assertNull(ints[0]);
413	>	public void testToArray2()      { testToArray2(false); }
414	>	public void testToArray2_fair() { testToArray2(true); }
415	>	public void testToArray2(boolean fair) {
416	>	final SynchronousQueue<Item> q = new SynchronousQueue<>(fair);
417	>	Item[] a;
418	>
419	>	a = new Item[0];
420	>	assertSame(a, q.toArray(a));
421	>
422	>	a = new Item[3];
423	>	Arrays.fill(a, fortytwo);
424	>	assertSame(a, q.toArray(a));
425	>	assertNull(a[0]);
426	>	for (int i = 1; i < a.length; i++)
427	>	mustEqual(42, a[i]);
428		}
429	<
429	>
430		/**
431	<	*
431	>	* toArray(null) throws NPE
432		*/
433	<	public void testIterator() {
434	<	SynchronousQueue q = new SynchronousQueue();
435	<	Iterator it = q.iterator();
436	<	assertFalse(it.hasNext());
433	>	public void testToArray_null()      { testToArray_null(false); }
434	>	public void testToArray_null_fair() { testToArray_null(true); }
435	>	public void testToArray_null(boolean fair) {
436	>	final SynchronousQueue<Item> q = new SynchronousQueue<>(fair);
437		try {
438	<	Object x = it.next();
438	>	Object[] unused = q.toArray((Object[])null);
439		shouldThrow();
440	<	}
430	<	catch (NoSuchElementException success) {}
440	>	} catch (NullPointerException success) {}
441		}
442
443		/**
444	<	*
444	>	* iterator does not traverse any elements
445		*/
446	<	public void testIteratorRemove() {
447	<	SynchronousQueue q = new SynchronousQueue();
448	<	Iterator it = q.iterator();
446	>	public void testIterator()      { testIterator(false); }
447	>	public void testIterator_fair() { testIterator(true); }
448	>	public void testIterator(boolean fair) {
449	>	assertIteratorExhausted(new SynchronousQueue<Item>(fair).iterator());
450	>	}
451	>
452	>	/**
453	>	* iterator remove throws IllegalStateException
454	>	*/
455	>	public void testIteratorRemove()      { testIteratorRemove(false); }
456	>	public void testIteratorRemove_fair() { testIteratorRemove(true); }
457	>	public void testIteratorRemove(boolean fair) {
458	>	final SynchronousQueue<Item> q = new SynchronousQueue<>(fair);
459	>	Iterator<? extends Item> it = q.iterator();
460		try {
461		it.remove();
462		shouldThrow();
463	<	}
443	<	catch (IllegalStateException success) {}
463	>	} catch (IllegalStateException success) {}
464		}
465
466		/**
467	<	*
467	>	* toString returns a non-null string
468		*/
469	<	public void testToString() {
470	<	SynchronousQueue q = new SynchronousQueue();
469	>	public void testToString()      { testToString(false); }
470	>	public void testToString_fair() { testToString(true); }
471	>	public void testToString(boolean fair) {
472	>	final SynchronousQueue<Item> q = new SynchronousQueue<>(fair);
473		String s = q.toString();
474	<	assertTrue(s != null);
475	<	}
454	<
474	>	assertNotNull(s);
475	>	}
476
477		/**
478	<	*
478	>	* offer transfers elements across Executor tasks
479		*/
480	<	public void testOfferInExecutor() {
481	<	final SynchronousQueue q = new SynchronousQueue();
482	<	ExecutorService executor = Executors.newFixedThreadPool(2);
483	<	final Integer one = new Integer(1);
484	<
485	<	executor.execute(new Runnable() {
486	<	public void run() {
487	<	threadAssertFalse(q.offer(one));
488	<	try {
489	<	threadAssertTrue(q.offer(one, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
490	<	threadAssertEquals(0, q.remainingCapacity());
491	<	}
492	<	catch (InterruptedException e) {
493	<	threadUnexpectedException();
494	<	}
474	<	}
475	<	});
476	<
477	<	executor.execute(new Runnable() {
478	<	public void run() {
479	<	try {
480	<	Thread.sleep(SMALL_DELAY_MS);
481	<	threadAssertEquals(one, q.take());
482	<	}
483	<	catch (InterruptedException e) {
484	<	threadUnexpectedException();
485	<	}
486	<	}
487	<	});
488	<
489	<	joinPool(executor);
480	>	public void testOfferInExecutor()      { testOfferInExecutor(false); }
481	>	public void testOfferInExecutor_fair() { testOfferInExecutor(true); }
482	>	public void testOfferInExecutor(boolean fair) {
483	>	final SynchronousQueue<Item> q = new SynchronousQueue<>(fair);
484	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
485	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
486	>	try (PoolCleaner cleaner = cleaner(executor)) {
487	>
488	>	executor.execute(new CheckedRunnable() {
489	>	public void realRun() throws InterruptedException {
490	>	assertFalse(q.offer(one));
491	>	threadsStarted.await();
492	>	assertTrue(q.offer(one, LONG_DELAY_MS, MILLISECONDS));
493	>	mustEqual(0, q.remainingCapacity());
494	>	}});
495
496	+	executor.execute(new CheckedRunnable() {
497	+	public void realRun() throws InterruptedException {
498	+	threadsStarted.await();
499	+	assertSame(one, q.take());
500	+	}});
501	+	}
502		}
503
504		/**
505	<	*
505	>	* timed poll retrieves elements across Executor threads
506		*/
507	<	public void testPollInExecutor() {
508	<
509	<	final SynchronousQueue q = new SynchronousQueue();
510	<
511	<	ExecutorService executor = Executors.newFixedThreadPool(2);
512	<
513	<	executor.execute(new Runnable() {
514	<	public void run() {
515	<	threadAssertNull(q.poll());
516	<	try {
517	<	threadAssertTrue(null != q.poll(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
518	<	threadAssertTrue(q.isEmpty());
519	<	}
520	<	catch (InterruptedException e) {
510	<	threadUnexpectedException();
511	<	}
512	<	}
513	<	});
514	<
515	<	executor.execute(new Runnable() {
516	<	public void run() {
517	<	try {
518	<	Thread.sleep(SMALL_DELAY_MS);
519	<	q.put(new Integer(1));
520	<	}
521	<	catch (InterruptedException e) {
522	<	threadUnexpectedException();
523	<	}
524	<	}
525	<	});
526	<
527	<	joinPool(executor);
507	>	public void testPollInExecutor()      { testPollInExecutor(false); }
508	>	public void testPollInExecutor_fair() { testPollInExecutor(true); }
509	>	public void testPollInExecutor(boolean fair) {
510	>	final SynchronousQueue<Item> q = new SynchronousQueue<>(fair);
511	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
512	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
513	>	try (PoolCleaner cleaner = cleaner(executor)) {
514	>	executor.execute(new CheckedRunnable() {
515	>	public void realRun() throws InterruptedException {
516	>	assertNull(q.poll());
517	>	threadsStarted.await();
518	>	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
519	>	assertTrue(q.isEmpty());
520	>	}});
521
522	+	executor.execute(new CheckedRunnable() {
523	+	public void realRun() throws InterruptedException {
524	+	threadsStarted.await();
525	+	q.put(one);
526	+	}});
527	+	}
528		}
529
530		/**
531	<	*
531	>	* a deserialized/reserialized queue is usable
532		*/
533		public void testSerialization() {
534	<	SynchronousQueue q = new SynchronousQueue();
535	<	try {
536	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
537	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
538	<	out.writeObject(q);
539	<	out.close();
540	<
541	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
542	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
543	<	SynchronousQueue r = (SynchronousQueue)in.readObject();
544	<	assertEquals(q.size(), r.size());
545	<	while (!q.isEmpty())
546	<	assertEquals(q.remove(), r.remove());
547	<	} catch(Exception e){
548	<	unexpectedException();
549	<	}
534	>	final SynchronousQueue<Item> x = new SynchronousQueue<>();
535	>	final SynchronousQueue<Item> y = new SynchronousQueue<>(false);
536	>	final SynchronousQueue<Item> z = new SynchronousQueue<>(true);
537	>	assertSerialEquals(x, y);
538	>	assertNotSerialEquals(x, z);
539	>	SynchronousQueue[] rqs = { x, y, z };
540	>	@SuppressWarnings("unchecked")
541	>	SynchronousQueue<Item>[] qs = (SynchronousQueue<Item>[])rqs;
542	>	for (SynchronousQueue<Item> q : qs) {
543	>	SynchronousQueue<Item> clone = serialClone(q);
544	>	assertNotSame(q, clone);
545	>	assertSerialEquals(q, clone);
546	>	assertTrue(clone.isEmpty());
547	>	mustEqual(0, clone.size());
548	>	mustEqual(0, clone.remainingCapacity());
549	>	assertFalse(clone.offer(zero));
550	>	}
551	>	}
552	>
553	>	/**
554	>	* drainTo(c) of empty queue doesn't transfer elements
555	>	*/
556	>	public void testDrainTo()      { testDrainTo(false); }
557	>	public void testDrainTo_fair() { testDrainTo(true); }
558	>	public void testDrainTo(boolean fair) {
559	>	final SynchronousQueue<Item> q = new SynchronousQueue<>(fair);
560	>	ArrayList<Item> l = new ArrayList<>();
561	>	q.drainTo(l);
562	>	mustEqual(0, q.size());
563	>	mustEqual(0, l.size());
564	>	}
565	>
566	>	/**
567	>	* drainTo empties queue, unblocking a waiting put.
568	>	*/
569	>	public void testDrainToWithActivePut()      { testDrainToWithActivePut(false); }
570	>	public void testDrainToWithActivePut_fair() { testDrainToWithActivePut(true); }
571	>	public void testDrainToWithActivePut(boolean fair) {
572	>	final SynchronousQueue<Item> q = new SynchronousQueue<>(fair);
573	>	Thread t = newStartedThread(new CheckedRunnable() {
574	>	public void realRun() throws InterruptedException {
575	>	q.put(one);
576	>	}});
577	>
578	>	ArrayList<Item> l = new ArrayList<>();
579	>	long startTime = System.nanoTime();
580	>	while (l.isEmpty()) {
581	>	q.drainTo(l);
582	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
583	>	fail("timed out");
584	>	Thread.yield();
585	>	}
586	>	mustEqual(1, l.size());
587	>	assertSame(one, l.get(0));
588	>	awaitTermination(t);
589	>	}
590	>
591	>	/**
592	>	* drainTo(c, n) empties up to n elements of queue into c
593	>	*/
594	>	public void testDrainToN() throws InterruptedException {
595	>	final SynchronousQueue<Item> q = new SynchronousQueue<>();
596	>	Thread t1 = newStartedThread(new CheckedRunnable() {
597	>	public void realRun() throws InterruptedException {
598	>	q.put(one);
599	>	}});
600	>
601	>	Thread t2 = newStartedThread(new CheckedRunnable() {
602	>	public void realRun() throws InterruptedException {
603	>	q.put(two);
604	>	}});
605	>
606	>	ArrayList<Item> l = new ArrayList<>();
607	>	int drained;
608	>	while ((drained = q.drainTo(l, 1)) == 0) Thread.yield();
609	>	mustEqual(1, drained);
610	>	mustEqual(1, l.size());
611	>	while ((drained = q.drainTo(l, 1)) == 0) Thread.yield();
612	>	mustEqual(1, drained);
613	>	mustEqual(2, l.size());
614	>	assertTrue(l.contains(one));
615	>	assertTrue(l.contains(two));
616	>	awaitTermination(t1);
617	>	awaitTermination(t2);
618	>	}
619	>
620	>	/**
621	>	* remove(null), contains(null) always return false
622	>	*/
623	>	public void testNeverContainsNull() {
624	>	Collection<?> q = new SynchronousQueue<>();
625	>	assertFalse(q.contains(null));
626	>	assertFalse(q.remove(null));
627		}
628
629		}

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