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Comparing jsr166/src/test/tck/SynchronousQueueTest.java (file contents):
Revision 1.3 by dl, Sun Sep 14 20:42:40 2003 UTC vs.
Revision 1.58 by jsr166, Sun May 14 04:02:06 2017 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.*;
9	<	import java.util.*;
10	<	import java.util.concurrent.*;
11	<	import java.io.*;
9	>	import static java.util.concurrent.TimeUnit.MILLISECONDS;
10
11	<	public class SynchronousQueueTest extends JSR166TestCase {
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	>	import java.util.concurrent.ThreadLocalRandom;
22
23	<	public static void main(String[] args) {
16	<	junit.textui.TestRunner.run (suite());
17	<	}
23	>	import junit.framework.Test;
24
25	<	public static Test suite() {
20	<	return new TestSuite(SynchronousQueueTest.class);
21	<	}
22	<
23	<	public void testEmptyFull() {
24	<	SynchronousQueue q = new SynchronousQueue();
25	<	assertTrue(q.isEmpty());
26	<	assertEquals(0, q.size());
27	<	assertEquals(0, q.remainingCapacity());
28	<	assertFalse(q.offer(new Integer(3)));
29	<	}
25	>	public class SynchronousQueueTest extends JSR166TestCase {
26
27	<	public void testOfferNull(){
28	<	try {
29	<	SynchronousQueue q = new SynchronousQueue();
30	<	q.offer(null);
35	<	fail("should throw NPE");
36	<	} catch (NullPointerException success) { }
27	>	public static class Fair extends BlockingQueueTest {
28	>	protected BlockingQueue emptyCollection() {
29	>	return new SynchronousQueue(true);
30	>	}
31		}
32
33	<	public void testOffer(){
34	<	SynchronousQueue q = new SynchronousQueue();
35	<	assertFalse(q.offer(new Integer(1)));
33	>	public static class NonFair extends BlockingQueueTest {
34	>	protected BlockingQueue emptyCollection() {
35	>	return new SynchronousQueue(false);
36	>	}
37		}
38
39	<	public void testAdd(){
40	<	try {
46	<	SynchronousQueue q = new SynchronousQueue();
47	<	assertEquals(0, q.remainingCapacity());
48	<	q.add(new Integer(0));
49	<	} catch (IllegalStateException success){
50	<	}
39	>	public static void main(String[] args) {
40	>	main(suite(), args);
41		}
42
43	<	public void testAddAll1(){
44	<	try {
45	<	SynchronousQueue q = new SynchronousQueue();
46	<	q.addAll(null);
57	<	fail("Cannot add null collection");
58	<	}
59	<	catch (NullPointerException success) {}
60	<	}
61	<	public void testAddAll2(){
62	<	try {
63	<	SynchronousQueue q = new SynchronousQueue();
64	<	Integer[] ints = new Integer[1];
65	<	q.addAll(Arrays.asList(ints));
66	<	fail("Cannot add null elements");
67	<	}
68	<	catch (NullPointerException success) {}
69	<	}
70	<	public void testAddAll4(){
71	<	try {
72	<	SynchronousQueue q = new SynchronousQueue();
73	<	Integer[] ints = new Integer[1];
74	<	for (int i = 0; i < 1; ++i)
75	<	ints[i] = new Integer(i);
76	<	q.addAll(Arrays.asList(ints));
77	<	fail("Cannot add with insufficient capacity");
78	<	}
79	<	catch (IllegalStateException success) {}
43	>	public static Test suite() {
44	>	return newTestSuite(SynchronousQueueTest.class,
45	>	new Fair().testSuite(),
46	>	new NonFair().testSuite());
47		}
48
49	<	public void testPutNull() {
50	<	try {
51	<	SynchronousQueue q = new SynchronousQueue();
52	<	q.put(null);
53	<	fail("put should throw NPE");
54	<	}
55	<	catch (NullPointerException success){
56	<	}
57	<	catch (InterruptedException ie) {
58	<	fail("Unexpected exception");
59	<	}
93	<	}
94	<
95	<	public void testBlockingPut(){
96	<	Thread t = new Thread(new Runnable() {
97	<	public void run() {
98	<	try {
99	<	SynchronousQueue q = new SynchronousQueue();
100	<	q.put(new Integer(0));
101	<	threadFail("put should block");
102	<	} catch (InterruptedException ie){
103	<	}
104	<	}});
105	<	t.start();
106	<	try {
107	<	Thread.sleep(SHORT_DELAY_MS);
108	<	t.interrupt();
109	<	t.join();
110	<	}
111	<	catch (InterruptedException ie) {
112	<	fail("Unexpected exception");
113	<	}
49	>	/**
50	>	* Any SynchronousQueue is both empty and full
51	>	*/
52	>	public void testEmptyFull()      { testEmptyFull(false); }
53	>	public void testEmptyFull_fair() { testEmptyFull(true); }
54	>	public void testEmptyFull(boolean fair) {
55	>	final SynchronousQueue q = new SynchronousQueue(fair);
56	>	assertTrue(q.isEmpty());
57	>	assertEquals(0, q.size());
58	>	assertEquals(0, q.remainingCapacity());
59	>	assertFalse(q.offer(zero));
60		}
61
62	<	public void testPutWithTake() {
63	<	final SynchronousQueue q = new SynchronousQueue();
64	<	Thread t = new Thread(new Runnable() {
65	<	public void run(){
66	<	int added = 0;
67	<	try {
68	<	q.put(new Object());
69	<	++added;
70	<	q.put(new Object());
71	<	++added;
72	<	q.put(new Object());
73	<	++added;
74	<	q.put(new Object());
75	<	++added;
76	<	threadFail("Should block");
77	<	} catch (InterruptedException e){
78	<	assertTrue(added >= 1);
79	<	}
134	<	}
135	<	});
62	>	/**
63	>	* offer fails if no active taker
64	>	*/
65	>	public void testOffer()      { testOffer(false); }
66	>	public void testOffer_fair() { testOffer(true); }
67	>	public void testOffer(boolean fair) {
68	>	SynchronousQueue q = new SynchronousQueue(fair);
69	>	assertFalse(q.offer(one));
70	>	}
71	>
72	>	/**
73	>	* add throws IllegalStateException if no active taker
74	>	*/
75	>	public void testAdd()      { testAdd(false); }
76	>	public void testAdd_fair() { testAdd(true); }
77	>	public void testAdd(boolean fair) {
78	>	SynchronousQueue q = new SynchronousQueue(fair);
79	>	assertEquals(0, q.remainingCapacity());
80		try {
81	<	t.start();
82	<	Thread.sleep(SHORT_DELAY_MS);
83	<	q.take();
84	<	Thread.sleep(SHORT_DELAY_MS);
85	<	t.interrupt();
86	<	t.join();
87	<	} catch (Exception e){
88	<	fail("Unexpected exception");
89	<	}
90	<	}
81	>	q.add(one);
82	>	shouldThrow();
83	>	} catch (IllegalStateException success) {}
84	>	}
85	>
86	>	/**
87	>	* addAll(this) throws IllegalArgumentException
88	>	*/
89	>	public void testAddAll_self()      { testAddAll_self(false); }
90	>	public void testAddAll_self_fair() { testAddAll_self(true); }
91	>	public void testAddAll_self(boolean fair) {
92	>	SynchronousQueue q = new SynchronousQueue(fair);
93	>	try {
94	>	q.addAll(q);
95	>	shouldThrow();
96	>	} catch (IllegalArgumentException success) {}
97	>	}
98	>
99	>	/**
100	>	* addAll throws ISE if no active taker
101	>	*/
102	>	public void testAddAll_ISE()      { testAddAll_ISE(false); }
103	>	public void testAddAll_ISE_fair() { testAddAll_ISE(true); }
104	>	public void testAddAll_ISE(boolean fair) {
105	>	SynchronousQueue q = new SynchronousQueue(fair);
106	>	Integer[] ints = new Integer[1];
107	>	for (int i = 0; i < ints.length; i++)
108	>	ints[i] = i;
109	>	Collection<Integer> coll = Arrays.asList(ints);
110	>	try {
111	>	q.addAll(coll);
112	>	shouldThrow();
113	>	} catch (IllegalStateException success) {}
114	>	}
115	>
116	>	/**
117	>	* put blocks interruptibly if no active taker
118	>	*/
119	>	public void testBlockingPut()      { testBlockingPut(false); }
120	>	public void testBlockingPut_fair() { testBlockingPut(true); }
121	>	public void testBlockingPut(boolean fair) {
122	>	final SynchronousQueue q = new SynchronousQueue(fair);
123	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
124	>	Thread t = newStartedThread(new CheckedRunnable() {
125	>	public void realRun() throws InterruptedException {
126	>	Thread.currentThread().interrupt();
127	>	try {
128	>	q.put(99);
129	>	shouldThrow();
130	>	} catch (InterruptedException success) {}
131	>	assertFalse(Thread.interrupted());
132
133	<	public void testTimedOffer() {
134	<	final SynchronousQueue q = new SynchronousQueue();
135	<	Thread t = new Thread(new Runnable() {
136	<	public void run(){
137	<	try {
138	<
139	<	threadAssertFalse(q.offer(new Object(), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
140	<	q.offer(new Object(), LONG_DELAY_MS, TimeUnit.MILLISECONDS);
141	<	threadFail("Should block");
142	<	} catch (InterruptedException success){}
143	<	}
144	<	});
145	<
161	<	try {
162	<	t.start();
163	<	Thread.sleep(SMALL_DELAY_MS);
164	<	t.interrupt();
165	<	t.join();
166	<	} catch (Exception e){
167	<	fail("Unexpected exception");
168	<	}
133	>	pleaseInterrupt.countDown();
134	>	try {
135	>	q.put(99);
136	>	shouldThrow();
137	>	} catch (InterruptedException success) {}
138	>	assertFalse(Thread.interrupted());
139	>	}});
140	>
141	>	await(pleaseInterrupt);
142	>	assertThreadBlocks(t, Thread.State.WAITING);
143	>	t.interrupt();
144	>	awaitTermination(t);
145	>	assertEquals(0, q.remainingCapacity());
146		}
147
148	+	/**
149	+	* put blocks interruptibly waiting for take
150	+	*/
151	+	public void testPutWithTake()      { testPutWithTake(false); }
152	+	public void testPutWithTake_fair() { testPutWithTake(true); }
153	+	public void testPutWithTake(boolean fair) {
154	+	final SynchronousQueue q = new SynchronousQueue(fair);
155	+	final CountDownLatch pleaseTake = new CountDownLatch(1);
156	+	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
157	+	Thread t = newStartedThread(new CheckedRunnable() {
158	+	public void realRun() throws InterruptedException {
159	+	pleaseTake.countDown();
160	+	q.put(one);
161
162	<	public void testTakeFromEmpty() {
163	<	final SynchronousQueue q = new SynchronousQueue();
164	<	Thread t = new Thread(new Runnable() {
165	<	public void run(){
166	<	try {
167	<	q.take();
178	<	threadFail("Should block");
179	<	} catch (InterruptedException success){ }
180	<	}
181	<	});
182	<	try {
183	<	t.start();
184	<	Thread.sleep(SHORT_DELAY_MS);
185	<	t.interrupt();
186	<	t.join();
187	<	} catch (Exception e){
188	<	fail("Unexpected exception");
189	<	}
190	<	}
191	<
192	<	public void testPoll(){
193	<	SynchronousQueue q = new SynchronousQueue();
194	<	assertNull(q.poll());
195	<	}
162	>	Thread.currentThread().interrupt();
163	>	try {
164	>	q.put(99);
165	>	shouldThrow();
166	>	} catch (InterruptedException success) {}
167	>	assertFalse(Thread.interrupted());
168
169	<	public void testTimedPoll0() {
170	<	try {
171	<	SynchronousQueue q = new SynchronousQueue();
172	<	assertNull(q.poll(0, TimeUnit.MILLISECONDS));
173	<	} catch (InterruptedException e){
174	<	fail("Unexpected exception");
175	<	}
204	<	}
169	>	pleaseInterrupt.countDown();
170	>	try {
171	>	q.put(99);
172	>	shouldThrow();
173	>	} catch (InterruptedException success) {}
174	>	assertFalse(Thread.interrupted());
175	>	}});
176
177	<	public void testTimedPoll() {
178	<	try {
179	<	SynchronousQueue q = new SynchronousQueue();
180	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
210	<	} catch (InterruptedException e){
211	<	fail("Unexpected exception");
212	<	}
213	<	}
177	>	await(pleaseTake);
178	>	assertEquals(0, q.remainingCapacity());
179	>	try { assertSame(one, q.take()); }
180	>	catch (InterruptedException e) { threadUnexpectedException(e); }
181
182	<	public void testInterruptedTimedPoll(){
183	<	Thread t = new Thread(new Runnable() {
184	<	public void run() {
185	<	try {
186	<	SynchronousQueue q = new SynchronousQueue();
220	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
221	<	} catch (InterruptedException success){
222	<	}
223	<	}});
224	<	t.start();
225	<	try {
226	<	Thread.sleep(SHORT_DELAY_MS);
227	<	t.interrupt();
228	<	t.join();
229	<	}
230	<	catch (InterruptedException ie) {
231	<	fail("Unexpected exception");
232	<	}
182	>	await(pleaseInterrupt);
183	>	assertThreadBlocks(t, Thread.State.WAITING);
184	>	t.interrupt();
185	>	awaitTermination(t);
186	>	assertEquals(0, q.remainingCapacity());
187		}
188
189	<	public void testTimedPollWithOffer(){
190	<	final SynchronousQueue q = new SynchronousQueue();
191	<	Thread t = new Thread(new Runnable() {
192	<	public void run(){
193	<	try {
194	<	threadAssertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
195	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
196	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
197	<	threadFail("Should block");
198	<	} catch (InterruptedException success) { }
199	<	}
200	<	});
201	<	try {
202	<	t.start();
203	<	Thread.sleep(SMALL_DELAY_MS);
204	<	assertTrue(q.offer(new Integer(0), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
205	<	t.interrupt();
206	<	t.join();
207	<	} catch (Exception e){
208	<	fail("Unexpected exception");
209	<	}
210	<	}
211	<
189	>	/**
190	>	* timed offer times out if elements not taken
191	>	*/
192	>	public void testTimedOffer() {
193	>	final boolean fair = ThreadLocalRandom.current().nextBoolean();
194	>	final SynchronousQueue q = new SynchronousQueue(fair);
195	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
196	>	Thread t = newStartedThread(new CheckedRunnable() {
197	>	public void realRun() throws InterruptedException {
198	>	long startTime = System.nanoTime();
199	>	assertFalse(q.offer(new Object(), timeoutMillis(), MILLISECONDS));
200	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
201	>	pleaseInterrupt.countDown();
202	>	try {
203	>	q.offer(new Object(), 2 * LONG_DELAY_MS, MILLISECONDS);
204	>	shouldThrow();
205	>	} catch (InterruptedException success) {}
206	>	assertFalse(Thread.interrupted());
207	>	}});
208	>
209	>	await(pleaseInterrupt);
210	>	assertThreadBlocks(t, Thread.State.TIMED_WAITING);
211	>	t.interrupt();
212	>	awaitTermination(t);
213	>	}
214	>
215	>	/**
216	>	* poll return null if no active putter
217	>	*/
218	>	public void testPoll()      { testPoll(false); }
219	>	public void testPoll_fair() { testPoll(true); }
220	>	public void testPoll(boolean fair) {
221	>	final SynchronousQueue q = new SynchronousQueue(fair);
222	>	assertNull(q.poll());
223	>	}
224	>
225	>	/**
226	>	* timed poll with zero timeout times out if no active putter
227	>	*/
228	>	public void testTimedPoll0()      { testTimedPoll0(false); }
229	>	public void testTimedPoll0_fair() { testTimedPoll0(true); }
230	>	public void testTimedPoll0(boolean fair) {
231	>	final SynchronousQueue q = new SynchronousQueue(fair);
232	>	try { assertNull(q.poll(0, MILLISECONDS)); }
233	>	catch (InterruptedException e) { threadUnexpectedException(e); }
234	>	}
235	>
236	>	/**
237	>	* timed poll with nonzero timeout times out if no active putter
238	>	*/
239	>	public void testTimedPoll() {
240	>	final boolean fair = ThreadLocalRandom.current().nextBoolean();
241	>	final SynchronousQueue q = new SynchronousQueue(fair);
242	>	final long startTime = System.nanoTime();
243	>	try { assertNull(q.poll(timeoutMillis(), MILLISECONDS)); }
244	>	catch (InterruptedException e) { threadUnexpectedException(e); }
245	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
246	>	}
247	>
248	>	/**
249	>	* timed poll before a delayed offer times out, returning null;
250	>	* after offer succeeds; on interruption throws
251	>	*/
252	>	public void testTimedPollWithOffer() {
253	>	final boolean fair = ThreadLocalRandom.current().nextBoolean();
254	>	final SynchronousQueue q = new SynchronousQueue(fair);
255	>	final CountDownLatch pleaseOffer = new CountDownLatch(1);
256	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
257	>	Thread t = newStartedThread(new CheckedRunnable() {
258	>	public void realRun() throws InterruptedException {
259	>	long startTime = System.nanoTime();
260	>	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
261	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
262	>
263	>	pleaseOffer.countDown();
264	>	startTime = System.nanoTime();
265	>	assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS));
266
267	<	public void testPeek(){
268	<	SynchronousQueue q = new SynchronousQueue();
269	<	assertNull(q.peek());
270	<	}
267	>	Thread.currentThread().interrupt();
268	>	try {
269	>	q.poll(LONG_DELAY_MS, MILLISECONDS);
270	>	shouldThrow();
271	>	} catch (InterruptedException success) {}
272	>	assertFalse(Thread.interrupted());
273
274	<	public void testElement(){
275	<	SynchronousQueue q = new SynchronousQueue();
274	>	pleaseInterrupt.countDown();
275	>	try {
276	>	q.poll(LONG_DELAY_MS, MILLISECONDS);
277	>	shouldThrow();
278	>	} catch (InterruptedException success) {}
279	>	assertFalse(Thread.interrupted());
280	>
281	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
282	>	}});
283	>
284	>	await(pleaseOffer);
285	>	long startTime = System.nanoTime();
286	>	try { assertTrue(q.offer(zero, LONG_DELAY_MS, MILLISECONDS)); }
287	>	catch (InterruptedException e) { threadUnexpectedException(e); }
288	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
289	>
290	>	await(pleaseInterrupt);
291	>	assertThreadBlocks(t, Thread.State.TIMED_WAITING);
292	>	t.interrupt();
293	>	awaitTermination(t);
294	>	}
295	>
296	>	/**
297	>	* peek() returns null if no active putter
298	>	*/
299	>	public void testPeek()      { testPeek(false); }
300	>	public void testPeek_fair() { testPeek(true); }
301	>	public void testPeek(boolean fair) {
302	>	final SynchronousQueue q = new SynchronousQueue(fair);
303	>	assertNull(q.peek());
304	>	}
305	>
306	>	/**
307	>	* element() throws NoSuchElementException if no active putter
308	>	*/
309	>	public void testElement()      { testElement(false); }
310	>	public void testElement_fair() { testElement(true); }
311	>	public void testElement(boolean fair) {
312	>	final SynchronousQueue q = new SynchronousQueue(fair);
313		try {
314		q.element();
315	<	fail("no such element");
316	<	}
270	<	catch (NoSuchElementException success) {}
315	>	shouldThrow();
316	>	} catch (NoSuchElementException success) {}
317		}
318
319	<	public void testRemove(){
320	<	SynchronousQueue q = new SynchronousQueue();
319	>	/**
320	>	* remove() throws NoSuchElementException if no active putter
321	>	*/
322	>	public void testRemove()      { testRemove(false); }
323	>	public void testRemove_fair() { testRemove(true); }
324	>	public void testRemove(boolean fair) {
325	>	final SynchronousQueue q = new SynchronousQueue(fair);
326		try {
327		q.remove();
328	<	fail("remove should throw");
329	<	} catch (NoSuchElementException success){
279	<	}
328	>	shouldThrow();
329	>	} catch (NoSuchElementException success) {}
330		}
331
332	<	public void testRemoveElement(){
333	<	SynchronousQueue q = new SynchronousQueue();
334	<	assertFalse(q.remove(new Integer(0)));
335	<	assertTrue(q.isEmpty());
336	<	}
337	<
338	<	public void testContains(){
339	<	SynchronousQueue q = new SynchronousQueue();
340	<	assertFalse(q.contains(new Integer(0)));
341	<	}
342	<
343	<	public void testClear(){
344	<	SynchronousQueue q = new SynchronousQueue();
332	>	/**
333	>	* contains returns false
334	>	*/
335	>	public void testContains()      { testContains(false); }
336	>	public void testContains_fair() { testContains(true); }
337	>	public void testContains(boolean fair) {
338	>	final SynchronousQueue q = new SynchronousQueue(fair);
339	>	assertFalse(q.contains(zero));
340	>	}
341	>
342	>	/**
343	>	* clear ensures isEmpty
344	>	*/
345	>	public void testClear()      { testClear(false); }
346	>	public void testClear_fair() { testClear(true); }
347	>	public void testClear(boolean fair) {
348	>	final SynchronousQueue q = new SynchronousQueue(fair);
349		q.clear();
350		assertTrue(q.isEmpty());
351		}
352
353	<	public void testContainsAll(){
354	<	SynchronousQueue q = new SynchronousQueue();
353	>	/**
354	>	* containsAll returns false unless empty
355	>	*/
356	>	public void testContainsAll()      { testContainsAll(false); }
357	>	public void testContainsAll_fair() { testContainsAll(true); }
358	>	public void testContainsAll(boolean fair) {
359	>	final SynchronousQueue q = new SynchronousQueue(fair);
360		Integer[] empty = new Integer[0];
361	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
362	<	//        assertTrue(q.containsAll(Arrays.asList(empty)));
361	>	assertTrue(q.containsAll(Arrays.asList(empty)));
362	>	Integer[] ints = new Integer[1]; ints[0] = zero;
363		assertFalse(q.containsAll(Arrays.asList(ints)));
364		}
365
366	<	public void testRetainAll(){
367	<	SynchronousQueue q = new SynchronousQueue();
366	>	/**
367	>	* retainAll returns false
368	>	*/
369	>	public void testRetainAll()      { testRetainAll(false); }
370	>	public void testRetainAll_fair() { testRetainAll(true); }
371	>	public void testRetainAll(boolean fair) {
372	>	final SynchronousQueue q = new SynchronousQueue(fair);
373		Integer[] empty = new Integer[0];
374	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
375	<	q.retainAll(Arrays.asList(ints));
376	<	//        assertTrue(q.containsAll(Arrays.asList(empty)));
313	<	assertFalse(q.containsAll(Arrays.asList(ints)));
374	>	assertFalse(q.retainAll(Arrays.asList(empty)));
375	>	Integer[] ints = new Integer[1]; ints[0] = zero;
376	>	assertFalse(q.retainAll(Arrays.asList(ints)));
377		}
378
379	<	public void testRemoveAll(){
380	<	SynchronousQueue q = new SynchronousQueue();
379	>	/**
380	>	* removeAll returns false
381	>	*/
382	>	public void testRemoveAll()      { testRemoveAll(false); }
383	>	public void testRemoveAll_fair() { testRemoveAll(true); }
384	>	public void testRemoveAll(boolean fair) {
385	>	final SynchronousQueue q = new SynchronousQueue(fair);
386		Integer[] empty = new Integer[0];
387	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
388	<	q.removeAll(Arrays.asList(ints));
321	<	//        assertTrue(q.containsAll(Arrays.asList(empty)));
387	>	assertFalse(q.removeAll(Arrays.asList(empty)));
388	>	Integer[] ints = new Integer[1]; ints[0] = zero;
389		assertFalse(q.containsAll(Arrays.asList(ints)));
390		}
391
392	<
393	<	public void testToArray(){
394	<	SynchronousQueue q = new SynchronousQueue();
395	<	Object[] o = q.toArray();
396	<	assertEquals(o.length, 0);
397	<	}
398	<
399	<	public void testToArray2(){
400	<	SynchronousQueue q = new SynchronousQueue();
401	<	Integer[] ints = new Integer[1];
402	<	assertNull(ints[0]);
403	<	}
404	<
405	<	public void testIterator(){
406	<	SynchronousQueue q = new SynchronousQueue();
407	<	Iterator it = q.iterator();
408	<	assertFalse(it.hasNext());
409	<	try {
410	<	Object x = it.next();
411	<	fail("should throw");
412	<	}
413	<	catch (NoSuchElementException success) {}
414	<	}
415	<
416	<	public void testIteratorRemove(){
417	<	SynchronousQueue q = new SynchronousQueue();
418	<	Iterator it = q.iterator();
392	>	/**
393	>	* toArray is empty
394	>	*/
395	>	public void testToArray()      { testToArray(false); }
396	>	public void testToArray_fair() { testToArray(true); }
397	>	public void testToArray(boolean fair) {
398	>	final SynchronousQueue q = new SynchronousQueue(fair);
399	>	Object[] o = q.toArray();
400	>	assertEquals(0, o.length);
401	>	}
402	>
403	>	/**
404	>	* toArray(Integer array) returns its argument with the first
405	>	* element (if present) nulled out
406	>	*/
407	>	public void testToArray2()      { testToArray2(false); }
408	>	public void testToArray2_fair() { testToArray2(true); }
409	>	public void testToArray2(boolean fair) {
410	>	final SynchronousQueue<Integer> q = new SynchronousQueue<>(fair);
411	>	Integer[] a;
412	>
413	>	a = new Integer[0];
414	>	assertSame(a, q.toArray(a));
415	>
416	>	a = new Integer[3];
417	>	Arrays.fill(a, 42);
418	>	assertSame(a, q.toArray(a));
419	>	assertNull(a[0]);
420	>	for (int i = 1; i < a.length; i++)
421	>	assertEquals(42, (int) a[i]);
422	>	}
423	>
424	>	/**
425	>	* toArray(null) throws NPE
426	>	*/
427	>	public void testToArray_null()      { testToArray_null(false); }
428	>	public void testToArray_null_fair() { testToArray_null(true); }
429	>	public void testToArray_null(boolean fair) {
430	>	final SynchronousQueue q = new SynchronousQueue(fair);
431	>	try {
432	>	Object[] o = q.toArray(null);
433	>	shouldThrow();
434	>	} catch (NullPointerException success) {}
435	>	}
436	>
437	>	/**
438	>	* iterator does not traverse any elements
439	>	*/
440	>	public void testIterator()      { testIterator(false); }
441	>	public void testIterator_fair() { testIterator(true); }
442	>	public void testIterator(boolean fair) {
443	>	assertIteratorExhausted(new SynchronousQueue(fair).iterator());
444	>	}
445	>
446	>	/**
447	>	* iterator remove throws ISE
448	>	*/
449	>	public void testIteratorRemove()      { testIteratorRemove(false); }
450	>	public void testIteratorRemove_fair() { testIteratorRemove(true); }
451	>	public void testIteratorRemove(boolean fair) {
452	>	final SynchronousQueue q = new SynchronousQueue(fair);
453	>	Iterator it = q.iterator();
454		try {
455		it.remove();
456	<	fail("should throw");
457	<	}
356	<	catch (IllegalStateException success) {}
456	>	shouldThrow();
457	>	} catch (IllegalStateException success) {}
458		}
459
460	<	public void testToString(){
461	<	SynchronousQueue q = new SynchronousQueue();
460	>	/**
461	>	* toString returns a non-null string
462	>	*/
463	>	public void testToString()      { testToString(false); }
464	>	public void testToString_fair() { testToString(true); }
465	>	public void testToString(boolean fair) {
466	>	final SynchronousQueue q = new SynchronousQueue(fair);
467		String s = q.toString();
468	<	assertTrue(s != null);
363	<	}
364	<
365	<
366	<	public void testOfferInExecutor() {
367	<	final SynchronousQueue q = new SynchronousQueue();
368	<	ExecutorService executor = Executors.newFixedThreadPool(2);
369	<	final Integer one = new Integer(1);
370	<
371	<	executor.execute(new Runnable() {
372	<	public void run() {
373	<	threadAssertFalse(q.offer(one));
374	<	try {
375	<	threadAssertTrue(q.offer(one, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
376	<	threadAssertEquals(0, q.remainingCapacity());
377	<	}
378	<	catch (InterruptedException e) {
379	<	threadFail("should not be interrupted");
380	<	}
381	<	}
382	<	});
383	<
384	<	executor.execute(new Runnable() {
385	<	public void run() {
386	<	try {
387	<	Thread.sleep(SMALL_DELAY_MS);
388	<	threadAssertEquals(one, q.take());
389	<	}
390	<	catch (InterruptedException e) {
391	<	fail("should not be interrupted");
392	<	}
393	<	}
394	<	});
395	<
396	<	joinPool(executor);
397	<
468	>	assertNotNull(s);
469		}
470
471	<	public void testPollInExecutor() {
472	<
473	<	final SynchronousQueue q = new SynchronousQueue();
474	<
475	<	ExecutorService executor = Executors.newFixedThreadPool(2);
471	>	/**
472	>	* offer transfers elements across Executor tasks
473	>	*/
474	>	public void testOfferInExecutor()      { testOfferInExecutor(false); }
475	>	public void testOfferInExecutor_fair() { testOfferInExecutor(true); }
476	>	public void testOfferInExecutor(boolean fair) {
477	>	final SynchronousQueue q = new SynchronousQueue(fair);
478	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
479	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
480	>	try (PoolCleaner cleaner = cleaner(executor)) {
481	>
482	>	executor.execute(new CheckedRunnable() {
483	>	public void realRun() throws InterruptedException {
484	>	assertFalse(q.offer(one));
485	>	threadsStarted.await();
486	>	assertTrue(q.offer(one, LONG_DELAY_MS, MILLISECONDS));
487	>	assertEquals(0, q.remainingCapacity());
488	>	}});
489
490	<	executor.execute(new Runnable() {
491	<	public void run() {
492	<	threadAssertNull(q.poll());
493	<	try {
494	<	threadAssertTrue(null != q.poll(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
495	<	threadAssertTrue(q.isEmpty());
496	<	}
413	<	catch (InterruptedException e) {
414	<	threadFail("should not be interrupted");
415	<	}
416	<	}
417	<	});
490	>	executor.execute(new CheckedRunnable() {
491	>	public void realRun() throws InterruptedException {
492	>	threadsStarted.await();
493	>	assertSame(one, q.take());
494	>	}});
495	>	}
496	>	}
497
498	<	executor.execute(new Runnable() {
499	<	public void run() {
500	<	try {
501	<	Thread.sleep(SMALL_DELAY_MS);
502	<	q.put(new Integer(1));
503	<	}
504	<	catch (InterruptedException e) {
505	<	threadFail("should not be interrupted");
506	<	}
507	<	}
508	<	});
509	<
510	<	joinPool(executor);
498	>	/**
499	>	* timed poll retrieves elements across Executor threads
500	>	*/
501	>	public void testPollInExecutor()      { testPollInExecutor(false); }
502	>	public void testPollInExecutor_fair() { testPollInExecutor(true); }
503	>	public void testPollInExecutor(boolean fair) {
504	>	final SynchronousQueue q = new SynchronousQueue(fair);
505	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
506	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
507	>	try (PoolCleaner cleaner = cleaner(executor)) {
508	>	executor.execute(new CheckedRunnable() {
509	>	public void realRun() throws InterruptedException {
510	>	assertNull(q.poll());
511	>	threadsStarted.await();
512	>	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
513	>	assertTrue(q.isEmpty());
514	>	}});
515
516	+	executor.execute(new CheckedRunnable() {
517	+	public void realRun() throws InterruptedException {
518	+	threadsStarted.await();
519	+	q.put(one);
520	+	}});
521	+	}
522		}
523
524	+	/**
525	+	* a deserialized serialized queue is usable
526	+	*/
527		public void testSerialization() {
528	<	SynchronousQueue q = new SynchronousQueue();
529	<	try {
530	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
531	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
532	<	out.writeObject(q);
533	<	out.close();
534	<
535	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
536	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
537	<	SynchronousQueue r = (SynchronousQueue)in.readObject();
538	<	assertEquals(q.size(), r.size());
539	<	while (!q.isEmpty())
540	<	assertEquals(q.remove(), r.remove());
541	<	} catch(Exception e){
450	<	fail("unexpected exception");
528	>	final SynchronousQueue x = new SynchronousQueue();
529	>	final SynchronousQueue y = new SynchronousQueue(false);
530	>	final SynchronousQueue z = new SynchronousQueue(true);
531	>	assertSerialEquals(x, y);
532	>	assertNotSerialEquals(x, z);
533	>	SynchronousQueue[] qs = { x, y, z };
534	>	for (SynchronousQueue q : qs) {
535	>	SynchronousQueue clone = serialClone(q);
536	>	assertNotSame(q, clone);
537	>	assertSerialEquals(q, clone);
538	>	assertTrue(clone.isEmpty());
539	>	assertEquals(0, clone.size());
540	>	assertEquals(0, clone.remainingCapacity());
541	>	assertFalse(clone.offer(zero));
542		}
543		}
544
545	+	/**
546	+	* drainTo(c) of empty queue doesn't transfer elements
547	+	*/
548	+	public void testDrainTo()      { testDrainTo(false); }
549	+	public void testDrainTo_fair() { testDrainTo(true); }
550	+	public void testDrainTo(boolean fair) {
551	+	final SynchronousQueue q = new SynchronousQueue(fair);
552	+	ArrayList l = new ArrayList();
553	+	q.drainTo(l);
554	+	assertEquals(0, q.size());
555	+	assertEquals(0, l.size());
556	+	}
557	+
558	+	/**
559	+	* drainTo empties queue, unblocking a waiting put.
560	+	*/
561	+	public void testDrainToWithActivePut()      { testDrainToWithActivePut(false); }
562	+	public void testDrainToWithActivePut_fair() { testDrainToWithActivePut(true); }
563	+	public void testDrainToWithActivePut(boolean fair) {
564	+	final SynchronousQueue q = new SynchronousQueue(fair);
565	+	Thread t = newStartedThread(new CheckedRunnable() {
566	+	public void realRun() throws InterruptedException {
567	+	q.put(one);
568	+	}});
569	+
570	+	ArrayList l = new ArrayList();
571	+	long startTime = System.nanoTime();
572	+	while (l.isEmpty()) {
573	+	q.drainTo(l);
574	+	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
575	+	fail("timed out");
576	+	Thread.yield();
577	+	}
578	+	assertEquals(1, l.size());
579	+	assertSame(one, l.get(0));
580	+	awaitTermination(t);
581	+	}
582	+
583	+	/**
584	+	* drainTo(c, n) empties up to n elements of queue into c
585	+	*/
586	+	public void testDrainToN() throws InterruptedException {
587	+	final SynchronousQueue q = new SynchronousQueue();
588	+	Thread t1 = newStartedThread(new CheckedRunnable() {
589	+	public void realRun() throws InterruptedException {
590	+	q.put(one);
591	+	}});
592	+
593	+	Thread t2 = newStartedThread(new CheckedRunnable() {
594	+	public void realRun() throws InterruptedException {
595	+	q.put(two);
596	+	}});
597	+
598	+	ArrayList l = new ArrayList();
599	+	int drained;
600	+	while ((drained = q.drainTo(l, 1)) == 0) Thread.yield();
601	+	assertEquals(1, drained);
602	+	assertEquals(1, l.size());
603	+	while ((drained = q.drainTo(l, 1)) == 0) Thread.yield();
604	+	assertEquals(1, drained);
605	+	assertEquals(2, l.size());
606	+	assertTrue(l.contains(one));
607	+	assertTrue(l.contains(two));
608	+	awaitTermination(t1);
609	+	awaitTermination(t2);
610	+	}
611	+
612	+	/**
613	+	* remove(null), contains(null) always return false
614	+	*/
615	+	public void testNeverContainsNull() {
616	+	Collection<?> q = new SynchronousQueue();
617	+	assertFalse(q.contains(null));
618	+	assertFalse(q.remove(null));
619	+	}
620	+
621		}

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