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

Comparing jsr166/src/test/tck/SynchronousQueueTest.java (file contents):
Revision 1.3 by dl, Sun Sep 14 20:42:40 2003 UTC vs.
Revision 1.26 by jsr166, Sat Oct 9 19:30:35 2010 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/licenses/publicdomain
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 static java.util.concurrent.TimeUnit.MILLISECONDS;
13		import java.io.*;
14
15		public class SynchronousQueueTest extends JSR166TestCase {
16
17	+	public static class Fair extends BlockingQueueTest {
18	+	protected BlockingQueue emptyCollection() {
19	+	return new SynchronousQueue(true);
20	+	}
21	+	}
22	+
23	+	public static class NonFair extends BlockingQueueTest {
24	+	protected BlockingQueue emptyCollection() {
25	+	return new SynchronousQueue(false);
26	+	}
27	+	}
28	+
29		public static void main(String[] args) {
30	<	junit.textui.TestRunner.run (suite());
30	>	junit.textui.TestRunner.run(suite());
31		}
32
33		public static Test suite() {
34	<	return new TestSuite(SynchronousQueueTest.class);
34	>	return newTestSuite(SynchronousQueueTest.class,
35	>	new Fair().testSuite(),
36	>	new NonFair().testSuite());
37		}
38
39	+	/**
40	+	* A SynchronousQueue is both empty and full
41	+	*/
42		public void testEmptyFull() {
43		SynchronousQueue q = new SynchronousQueue();
44		assertTrue(q.isEmpty());
45	<	assertEquals(0, q.size());
45	>	assertEquals(0, q.size());
46	>	assertEquals(0, q.remainingCapacity());
47	>	assertFalse(q.offer(zero));
48	>	}
49	>
50	>	/**
51	>	* A fair SynchronousQueue is both empty and full
52	>	*/
53	>	public void testFairEmptyFull() {
54	>	SynchronousQueue q = new SynchronousQueue(true);
55	>	assertTrue(q.isEmpty());
56	>	assertEquals(0, q.size());
57		assertEquals(0, q.remainingCapacity());
58	<	assertFalse(q.offer(new Integer(3)));
58	>	assertFalse(q.offer(zero));
59		}
60
61	<	public void testOfferNull(){
62	<	try {
61	>	/**
62	>	* offer(null) throws NPE
63	>	*/
64	>	public void testOfferNull() {
65	>	try {
66		SynchronousQueue q = new SynchronousQueue();
67		q.offer(null);
68	<	fail("should throw NPE");
69	<	} catch (NullPointerException success) { }
68	>	shouldThrow();
69	>	} catch (NullPointerException success) {}
70	>	}
71	>
72	>	/**
73	>	* add(null) throws NPE
74	>	*/
75	>	public void testAddNull() {
76	>	try {
77	>	SynchronousQueue q = new SynchronousQueue();
78	>	q.add(null);
79	>	shouldThrow();
80	>	} catch (NullPointerException success) {}
81		}
82
83	<	public void testOffer(){
83	>	/**
84	>	* offer fails if no active taker
85	>	*/
86	>	public void testOffer() {
87		SynchronousQueue q = new SynchronousQueue();
88	<	assertFalse(q.offer(new Integer(1)));
88	>	assertFalse(q.offer(one));
89		}
90
91	<	public void testAdd(){
92	<	try {
91	>	/**
92	>	* add throws ISE if no active taker
93	>	*/
94	>	public void testAdd() {
95	>	try {
96		SynchronousQueue q = new SynchronousQueue();
97		assertEquals(0, q.remainingCapacity());
98	<	q.add(new Integer(0));
99	<	} catch (IllegalStateException success){
100	<	}
98	>	q.add(one);
99	>	shouldThrow();
100	>	} catch (IllegalStateException success) {}
101		}
102
103	<	public void testAddAll1(){
103	>	/**
104	>	* addAll(null) throws NPE
105	>	*/
106	>	public void testAddAll1() {
107		try {
108		SynchronousQueue q = new SynchronousQueue();
109		q.addAll(null);
110	<	fail("Cannot add null collection");
111	<	}
59	<	catch (NullPointerException success) {}
110	>	shouldThrow();
111	>	} catch (NullPointerException success) {}
112		}
113	<	public void testAddAll2(){
113	>
114	>	/**
115	>	* addAll(this) throws IAE
116	>	*/
117	>	public void testAddAllSelf() {
118	>	try {
119	>	SynchronousQueue q = new SynchronousQueue();
120	>	q.addAll(q);
121	>	shouldThrow();
122	>	} catch (IllegalArgumentException success) {}
123	>	}
124	>
125	>	/**
126	>	* addAll of a collection with null elements throws NPE
127	>	*/
128	>	public void testAddAll2() {
129		try {
130		SynchronousQueue q = new SynchronousQueue();
131		Integer[] ints = new Integer[1];
132		q.addAll(Arrays.asList(ints));
133	<	fail("Cannot add null elements");
134	<	}
68	<	catch (NullPointerException success) {}
133	>	shouldThrow();
134	>	} catch (NullPointerException success) {}
135		}
136	<	public void testAddAll4(){
136	>
137	>	/**
138	>	* addAll throws ISE if no active taker
139	>	*/
140	>	public void testAddAll4() {
141		try {
142		SynchronousQueue q = new SynchronousQueue();
143		Integer[] ints = new Integer[1];
144		for (int i = 0; i < 1; ++i)
145		ints[i] = new Integer(i);
146		q.addAll(Arrays.asList(ints));
147	<	fail("Cannot add with insufficient capacity");
148	<	}
79	<	catch (IllegalStateException success) {}
147	>	shouldThrow();
148	>	} catch (IllegalStateException success) {}
149		}
150
151	<	public void testPutNull() {
152	<	try {
151	>	/**
152	>	* put(null) throws NPE
153	>	*/
154	>	public void testPutNull() throws InterruptedException {
155	>	try {
156		SynchronousQueue q = new SynchronousQueue();
157		q.put(null);
158	<	fail("put should throw NPE");
159	<	}
88	<	catch (NullPointerException success){
89	<	}
90	<	catch (InterruptedException ie) {
91	<	fail("Unexpected exception");
92	<	}
158	>	shouldThrow();
159	>	} catch (NullPointerException success) {}
160		}
161
162	<	public void testBlockingPut(){
163	<	Thread t = new Thread(new Runnable() {
164	<	public void run() {
165	<	try {
166	<	SynchronousQueue q = new SynchronousQueue();
167	<	q.put(new Integer(0));
168	<	threadFail("put should block");
169	<	} catch (InterruptedException ie){
170	<	}
171	<	}});
172	<	t.start();
173	<	try {
174	<	Thread.sleep(SHORT_DELAY_MS);
175	<	t.interrupt();
109	<	t.join();
110	<	}
111	<	catch (InterruptedException ie) {
112	<	fail("Unexpected exception");
113	<	}
162	>	/**
163	>	* put blocks interruptibly if no active taker
164	>	*/
165	>	public void testBlockingPut() throws InterruptedException {
166	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
167	>	public void realRun() throws InterruptedException {
168	>	SynchronousQueue q = new SynchronousQueue();
169	>	q.put(zero);
170	>	}});
171	>
172	>	t.start();
173	>	Thread.sleep(SHORT_DELAY_MS);
174	>	t.interrupt();
175	>	t.join();
176		}
177
178	<	public void testPutWithTake() {
178	>	/**
179	>	* put blocks waiting for take
180	>	*/
181	>	public void testPutWithTake() throws InterruptedException {
182		final SynchronousQueue q = new SynchronousQueue();
183	<	Thread t = new Thread(new Runnable() {
184	<	public void run(){
185	<	int added = 0;
186	<	try {
187	<	q.put(new Object());
188	<	++added;
124	<	q.put(new Object());
125	<	++added;
126	<	q.put(new Object());
127	<	++added;
128	<	q.put(new Object());
183	>	Thread t = new Thread(new CheckedRunnable() {
184	>	public void realRun() throws InterruptedException {
185	>	int added = 0;
186	>	try {
187	>	while (true) {
188	>	q.put(added);
189		++added;
130	–	threadFail("Should block");
131	–	} catch (InterruptedException e){
132	–	assertTrue(added >= 1);
190		}
191	+	} catch (InterruptedException success) {
192	+	assertEquals(1, added);
193		}
194	<	});
195	<	try {
196	<	t.start();
197	<	Thread.sleep(SHORT_DELAY_MS);
198	<	q.take();
199	<	Thread.sleep(SHORT_DELAY_MS);
200	<	t.interrupt();
201	<	t.join();
143	<	} catch (Exception e){
144	<	fail("Unexpected exception");
145	<	}
194	>	}});
195	>
196	>	t.start();
197	>	Thread.sleep(SHORT_DELAY_MS);
198	>	assertEquals(0, q.take());
199	>	Thread.sleep(SHORT_DELAY_MS);
200	>	t.interrupt();
201	>	t.join();
202		}
203
204	<	public void testTimedOffer() {
204	>	/**
205	>	* timed offer times out if elements not taken
206	>	*/
207	>	public void testTimedOffer() throws InterruptedException {
208		final SynchronousQueue q = new SynchronousQueue();
209	<	Thread t = new Thread(new Runnable() {
210	<	public void run(){
211	<	try {
212	<
213	<	threadAssertFalse(q.offer(new Object(), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
214	<	q.offer(new Object(), LONG_DELAY_MS, TimeUnit.MILLISECONDS);
215	<	threadFail("Should block");
216	<	} catch (InterruptedException success){}
217	<	}
218	<	});
160	<
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	<	}
209	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
210	>	public void realRun() throws InterruptedException {
211	>	assertFalse(q.offer(new Object(), SHORT_DELAY_MS, MILLISECONDS));
212	>	q.offer(new Object(), LONG_DELAY_MS, MILLISECONDS);
213	>	}});
214	>
215	>	t.start();
216	>	Thread.sleep(SMALL_DELAY_MS);
217	>	t.interrupt();
218	>	t.join();
219		}
220
221
222	<	public void testTakeFromEmpty() {
222	>	/**
223	>	* take blocks interruptibly when empty
224	>	*/
225	>	public void testTakeFromEmpty() throws InterruptedException {
226		final SynchronousQueue q = new SynchronousQueue();
227	<	Thread t = new Thread(new Runnable() {
228	<	public void run(){
229	<	try {
230	<	q.take();
231	<	threadFail("Should block");
232	<	} catch (InterruptedException success){ }
227	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
228	>	public void realRun() throws InterruptedException {
229	>	q.take();
230	>	}});
231	>
232	>	t.start();
233	>	Thread.sleep(SHORT_DELAY_MS);
234	>	t.interrupt();
235	>	t.join();
236	>	}
237	>
238	>
239	>	/**
240	>	* put blocks interruptibly if no active taker
241	>	*/
242	>	public void testFairBlockingPut() throws InterruptedException {
243	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
244	>	public void realRun() throws InterruptedException {
245	>	SynchronousQueue q = new SynchronousQueue(true);
246	>	q.put(zero);
247	>	}});
248	>
249	>	t.start();
250	>	Thread.sleep(SHORT_DELAY_MS);
251	>	t.interrupt();
252	>	t.join();
253	>	}
254	>
255	>	/**
256	>	* put blocks waiting for take
257	>	*/
258	>	public void testFairPutWithTake() throws InterruptedException {
259	>	final SynchronousQueue q = new SynchronousQueue(true);
260	>	Thread t = new Thread(new CheckedRunnable() {
261	>	public void realRun() throws InterruptedException {
262	>	int added = 0;
263	>	try {
264	>	while (true) {
265	>	q.put(added);
266	>	++added;
267	>	}
268	>	} catch (InterruptedException success) {
269	>	assertEquals(1, added);
270		}
271	<	});
272	<	try {
273	<	t.start();
274	<	Thread.sleep(SHORT_DELAY_MS);
275	<	t.interrupt();
276	<	t.join();
277	<	} catch (Exception e){
278	<	fail("Unexpected exception");
279	<	}
271	>	}});
272	>
273	>	t.start();
274	>	Thread.sleep(SHORT_DELAY_MS);
275	>	assertEquals(0, q.take());
276	>	Thread.sleep(SHORT_DELAY_MS);
277	>	t.interrupt();
278	>	t.join();
279	>	}
280	>
281	>	/**
282	>	* timed offer times out if elements not taken
283	>	*/
284	>	public void testFairTimedOffer() throws InterruptedException {
285	>	final SynchronousQueue q = new SynchronousQueue(true);
286	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
287	>	public void realRun() throws InterruptedException {
288	>	assertFalse(q.offer(new Object(), SHORT_DELAY_MS, MILLISECONDS));
289	>	q.offer(new Object(), LONG_DELAY_MS, MILLISECONDS);
290	>	}});
291	>
292	>	t.start();
293	>	Thread.sleep(SMALL_DELAY_MS);
294	>	t.interrupt();
295	>	t.join();
296	>	}
297	>
298	>
299	>	/**
300	>	* take blocks interruptibly when empty
301	>	*/
302	>	public void testFairTakeFromEmpty() throws InterruptedException {
303	>	final SynchronousQueue q = new SynchronousQueue(true);
304	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
305	>	public void realRun() throws InterruptedException {
306	>	q.take();
307	>	}});
308	>
309	>	t.start();
310	>	Thread.sleep(SHORT_DELAY_MS);
311	>	t.interrupt();
312	>	t.join();
313		}
314
315	<	public void testPoll(){
315	>	/**
316	>	* poll fails unless active taker
317	>	*/
318	>	public void testPoll() {
319		SynchronousQueue q = new SynchronousQueue();
320	<	assertNull(q.poll());
320	>	assertNull(q.poll());
321		}
322
323	<	public void testTimedPoll0() {
324	<	try {
325	<	SynchronousQueue q = new SynchronousQueue();
326	<	assertNull(q.poll(0, TimeUnit.MILLISECONDS));
327	<	} catch (InterruptedException e){
328	<	fail("Unexpected exception");
203	<	}
323	>	/**
324	>	* timed pool with zero timeout times out if no active taker
325	>	*/
326	>	public void testTimedPoll0() throws InterruptedException {
327	>	SynchronousQueue q = new SynchronousQueue();
328	>	assertNull(q.poll(0, MILLISECONDS));
329		}
330
331	<	public void testTimedPoll() {
332	<	try {
333	<	SynchronousQueue q = new SynchronousQueue();
334	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
335	<	} catch (InterruptedException e){
336	<	fail("Unexpected exception");
212	<	}
213	<	}
214	<
215	<	public void testInterruptedTimedPoll(){
216	<	Thread t = new Thread(new Runnable() {
217	<	public void run() {
218	<	try {
219	<	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	<	}
331	>	/**
332	>	* timed pool with nonzero timeout times out if no active taker
333	>	*/
334	>	public void testTimedPoll() throws InterruptedException {
335	>	SynchronousQueue q = new SynchronousQueue();
336	>	assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
337		}
338
339	<	public void testTimedPollWithOffer(){
339	>	/**
340	>	* Interrupted timed poll throws InterruptedException instead of
341	>	* returning timeout status
342	>	*/
343	>	public void testInterruptedTimedPoll() throws InterruptedException {
344		final SynchronousQueue q = new SynchronousQueue();
345	<	Thread t = new Thread(new Runnable() {
346	<	public void run(){
347	<	try {
348	<	threadAssertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
241	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
242	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
243	<	threadFail("Should block");
244	<	} catch (InterruptedException success) { }
245	<	}
246	<	});
247	<	try {
248	<	t.start();
249	<	Thread.sleep(SMALL_DELAY_MS);
250	<	assertTrue(q.offer(new Integer(0), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
251	<	t.interrupt();
252	<	t.join();
253	<	} catch (Exception e){
254	<	fail("Unexpected exception");
255	<	}
256	<	}
345	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
346	>	public void realRun() throws InterruptedException {
347	>	q.poll(SMALL_DELAY_MS, MILLISECONDS);
348	>	}});
349
350	+	t.start();
351	+	Thread.sleep(SHORT_DELAY_MS);
352	+	t.interrupt();
353	+	t.join();
354	+	}
355	+
356	+	/**
357	+	* Interrupted timed poll throws InterruptedException instead of
358	+	* returning timeout status
359	+	*/
360	+	public void testFairInterruptedTimedPoll() throws InterruptedException {
361	+	Thread t = new Thread(new CheckedInterruptedRunnable() {
362	+	public void realRun() throws InterruptedException {
363	+	SynchronousQueue q = new SynchronousQueue(true);
364	+	q.poll(SMALL_DELAY_MS, MILLISECONDS);
365	+	}});
366
367	<	public void testPeek(){
367	>	t.start();
368	>	Thread.sleep(SHORT_DELAY_MS);
369	>	t.interrupt();
370	>	t.join();
371	>	}
372	>
373	>	/**
374	>	* timed poll before a delayed offer fails; after offer succeeds;
375	>	* on interruption throws
376	>	*/
377	>	public void testFairTimedPollWithOffer() throws InterruptedException {
378	>	final SynchronousQueue q = new SynchronousQueue(true);
379	>	Thread t = new Thread(new CheckedRunnable() {
380	>	public void realRun() throws InterruptedException {
381	>	try {
382	>	assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
383	>	assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS));
384	>	q.poll(LONG_DELAY_MS, MILLISECONDS);
385	>	threadShouldThrow();
386	>	} catch (InterruptedException success) {}
387	>	}});
388	>
389	>	t.start();
390	>	Thread.sleep(SMALL_DELAY_MS);
391	>	assertTrue(q.offer(zero, SHORT_DELAY_MS, MILLISECONDS));
392	>	t.interrupt();
393	>	t.join();
394	>	}
395	>
396	>
397	>	/**
398	>	* peek returns null
399	>	*/
400	>	public void testPeek() {
401		SynchronousQueue q = new SynchronousQueue();
402	<	assertNull(q.peek());
402	>	assertNull(q.peek());
403		}
404
405	<	public void testElement(){
405	>	/**
406	>	* element throws NSEE
407	>	*/
408	>	public void testElement() {
409		SynchronousQueue q = new SynchronousQueue();
410		try {
411		q.element();
412	<	fail("no such element");
413	<	}
270	<	catch (NoSuchElementException success) {}
412	>	shouldThrow();
413	>	} catch (NoSuchElementException success) {}
414		}
415
416	<	public void testRemove(){
416	>	/**
417	>	* remove throws NSEE if no active taker
418	>	*/
419	>	public void testRemove() {
420		SynchronousQueue q = new SynchronousQueue();
421		try {
422		q.remove();
423	<	fail("remove should throw");
424	<	} catch (NoSuchElementException success){
279	<	}
423	>	shouldThrow();
424	>	} catch (NoSuchElementException success) {}
425		}
426
427	<	public void testRemoveElement(){
427	>	/**
428	>	* remove(x) returns false
429	>	*/
430	>	public void testRemoveElement() {
431		SynchronousQueue q = new SynchronousQueue();
432	<	assertFalse(q.remove(new Integer(0)));
432	>	assertFalse(q.remove(zero));
433		assertTrue(q.isEmpty());
434		}
435	<
436	<	public void testContains(){
437	<	SynchronousQueue q = new SynchronousQueue();
438	<	assertFalse(q.contains(new Integer(0)));
435	>
436	>	/**
437	>	* contains returns false
438	>	*/
439	>	public void testContains() {
440	>	SynchronousQueue q = new SynchronousQueue();
441	>	assertFalse(q.contains(zero));
442		}
443
444	<	public void testClear(){
444	>	/**
445	>	* clear ensures isEmpty
446	>	*/
447	>	public void testClear() {
448		SynchronousQueue q = new SynchronousQueue();
449		q.clear();
450		assertTrue(q.isEmpty());
451		}
452
453	<	public void testContainsAll(){
453	>	/**
454	>	* containsAll returns false unless empty
455	>	*/
456	>	public void testContainsAll() {
457		SynchronousQueue q = new SynchronousQueue();
458		Integer[] empty = new Integer[0];
459	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
460	<	//        assertTrue(q.containsAll(Arrays.asList(empty)));
459	>	assertTrue(q.containsAll(Arrays.asList(empty)));
460	>	Integer[] ints = new Integer[1]; ints[0] = zero;
461		assertFalse(q.containsAll(Arrays.asList(ints)));
462		}
463
464	<	public void testRetainAll(){
464	>	/**
465	>	* retainAll returns false
466	>	*/
467	>	public void testRetainAll() {
468		SynchronousQueue q = new SynchronousQueue();
469		Integer[] empty = new Integer[0];
470	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
471	<	q.retainAll(Arrays.asList(ints));
472	<	//        assertTrue(q.containsAll(Arrays.asList(empty)));
313	<	assertFalse(q.containsAll(Arrays.asList(ints)));
470	>	assertFalse(q.retainAll(Arrays.asList(empty)));
471	>	Integer[] ints = new Integer[1]; ints[0] = zero;
472	>	assertFalse(q.retainAll(Arrays.asList(ints)));
473		}
474
475	<	public void testRemoveAll(){
475	>	/**
476	>	* removeAll returns false
477	>	*/
478	>	public void testRemoveAll() {
479		SynchronousQueue q = new SynchronousQueue();
480		Integer[] empty = new Integer[0];
481	<	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
482	<	q.removeAll(Arrays.asList(ints));
321	<	//        assertTrue(q.containsAll(Arrays.asList(empty)));
481	>	assertFalse(q.removeAll(Arrays.asList(empty)));
482	>	Integer[] ints = new Integer[1]; ints[0] = zero;
483		assertFalse(q.containsAll(Arrays.asList(ints)));
484		}
485
486
487	<	public void testToArray(){
487	>	/**
488	>	* toArray is empty
489	>	*/
490	>	public void testToArray() {
491		SynchronousQueue q = new SynchronousQueue();
492	<	Object[] o = q.toArray();
492	>	Object[] o = q.toArray();
493		assertEquals(o.length, 0);
494		}
495
496	<	public void testToArray2(){
496	>	/**
497	>	* toArray(a) is nulled at position 0
498	>	*/
499	>	public void testToArray2() {
500		SynchronousQueue q = new SynchronousQueue();
501	<	Integer[] ints = new Integer[1];
501	>	Integer[] ints = new Integer[1];
502		assertNull(ints[0]);
503		}
504	<
505	<	public void testIterator(){
504	>
505	>	/**
506	>	* toArray(null) throws NPE
507	>	*/
508	>	public void testToArray_BadArg() {
509		SynchronousQueue q = new SynchronousQueue();
510	<	Iterator it = q.iterator();
510	>	try {
511	>	Object o[] = q.toArray(null);
512	>	shouldThrow();
513	>	} catch (NullPointerException success) {}
514	>	}
515	>
516	>
517	>	/**
518	>	* iterator does not traverse any elements
519	>	*/
520	>	public void testIterator() {
521	>	SynchronousQueue q = new SynchronousQueue();
522	>	Iterator it = q.iterator();
523		assertFalse(it.hasNext());
524		try {
525		Object x = it.next();
526	<	fail("should throw");
527	<	}
346	<	catch (NoSuchElementException success) {}
526	>	shouldThrow();
527	>	} catch (NoSuchElementException success) {}
528		}
529
530	<	public void testIteratorRemove(){
530	>	/**
531	>	* iterator remove throws ISE
532	>	*/
533	>	public void testIteratorRemove() {
534		SynchronousQueue q = new SynchronousQueue();
535	<	Iterator it = q.iterator();
535	>	Iterator it = q.iterator();
536		try {
537		it.remove();
538	<	fail("should throw");
539	<	}
356	<	catch (IllegalStateException success) {}
538	>	shouldThrow();
539	>	} catch (IllegalStateException success) {}
540		}
541
542	<	public void testToString(){
542	>	/**
543	>	* toString returns a non-null string
544	>	*/
545	>	public void testToString() {
546		SynchronousQueue q = new SynchronousQueue();
547		String s = q.toString();
548	<	assertTrue(s != null);
549	<	}
548	>	assertNotNull(s);
549	>	}
550
551
552	+	/**
553	+	* offer transfers elements across Executor tasks
554	+	*/
555		public void testOfferInExecutor() {
556		final SynchronousQueue q = new SynchronousQueue();
557		ExecutorService executor = Executors.newFixedThreadPool(2);
369	–	final Integer one = new Integer(1);
558
559	<	executor.execute(new Runnable() {
560	<	public void run() {
561	<	threadAssertFalse(q.offer(one));
562	<	try {
563	<	threadAssertTrue(q.offer(one, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
564	<	threadAssertEquals(0, q.remainingCapacity());
565	<	}
566	<	catch (InterruptedException e) {
567	<	threadFail("should not be interrupted");
568	<	}
569	<	}
570	<	});
559	>	executor.execute(new CheckedRunnable() {
560	>	public void realRun() throws InterruptedException {
561	>	assertFalse(q.offer(one));
562	>	assertTrue(q.offer(one, MEDIUM_DELAY_MS, MILLISECONDS));
563	>	assertEquals(0, q.remainingCapacity());
564	>	}});
565	>
566	>	executor.execute(new CheckedRunnable() {
567	>	public void realRun() throws InterruptedException {
568	>	Thread.sleep(SMALL_DELAY_MS);
569	>	assertSame(one, q.take());
570	>	}});
571
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	–
572		joinPool(executor);
397	–
573		}
574
575	+	/**
576	+	* poll retrieves elements across Executor threads
577	+	*/
578		public void testPollInExecutor() {
401	–
579		final SynchronousQueue q = new SynchronousQueue();
403	–
580		ExecutorService executor = Executors.newFixedThreadPool(2);
581	+	executor.execute(new CheckedRunnable() {
582	+	public void realRun() throws InterruptedException {
583	+	assertNull(q.poll());
584	+	assertSame(one, q.poll(MEDIUM_DELAY_MS, MILLISECONDS));
585	+	assertTrue(q.isEmpty());
586	+	}});
587	+
588	+	executor.execute(new CheckedRunnable() {
589	+	public void realRun() throws InterruptedException {
590	+	Thread.sleep(SHORT_DELAY_MS);
591	+	q.put(one);
592	+	}});
593
406	–	executor.execute(new Runnable() {
407	–	public void run() {
408	–	threadAssertNull(q.poll());
409	–	try {
410	–	threadAssertTrue(null != q.poll(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
411	–	threadAssertTrue(q.isEmpty());
412	–	}
413	–	catch (InterruptedException e) {
414	–	threadFail("should not be interrupted");
415	–	}
416	–	}
417	–	});
418	–
419	–	executor.execute(new Runnable() {
420	–	public void run() {
421	–	try {
422	–	Thread.sleep(SMALL_DELAY_MS);
423	–	q.put(new Integer(1));
424	–	}
425	–	catch (InterruptedException e) {
426	–	threadFail("should not be interrupted");
427	–	}
428	–	}
429	–	});
430	–
594		joinPool(executor);
595	+	}
596	+
597	+	/**
598	+	* a deserialized serialized queue is usable
599	+	*/
600	+	public void testSerialization() throws Exception {
601	+	SynchronousQueue q = new SynchronousQueue();
602	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
603	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
604	+	out.writeObject(q);
605	+	out.close();
606
607	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
608	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
609	+	SynchronousQueue r = (SynchronousQueue)in.readObject();
610	+	assertEquals(q.size(), r.size());
611	+	while (!q.isEmpty())
612	+	assertEquals(q.remove(), r.remove());
613		}
614
615	<	public void testSerialization() {
615	>	/**
616	>	* drainTo(null) throws NPE
617	>	*/
618	>	public void testDrainToNull() {
619		SynchronousQueue q = new SynchronousQueue();
620		try {
621	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
622	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
623	<	out.writeObject(q);
624	<	out.close();
625	<
626	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
627	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
628	<	SynchronousQueue r = (SynchronousQueue)in.readObject();
629	<	assertEquals(q.size(), r.size());
630	<	while (!q.isEmpty())
631	<	assertEquals(q.remove(), r.remove());
632	<	} catch(Exception e){
633	<	fail("unexpected exception");
634	<	}
621	>	q.drainTo(null);
622	>	shouldThrow();
623	>	} catch (NullPointerException success) {}
624	>	}
625	>
626	>	/**
627	>	* drainTo(this) throws IAE
628	>	*/
629	>	public void testDrainToSelf() {
630	>	SynchronousQueue q = new SynchronousQueue();
631	>	try {
632	>	q.drainTo(q);
633	>	shouldThrow();
634	>	} catch (IllegalArgumentException success) {}
635	>	}
636	>
637	>	/**
638	>	* drainTo(c) of empty queue doesn't transfer elements
639	>	*/
640	>	public void testDrainTo() {
641	>	SynchronousQueue q = new SynchronousQueue();
642	>	ArrayList l = new ArrayList();
643	>	q.drainTo(l);
644	>	assertEquals(q.size(), 0);
645	>	assertEquals(l.size(), 0);
646	>	}
647	>
648	>	/**
649	>	* drainTo empties queue, unblocking a waiting put.
650	>	*/
651	>	public void testDrainToWithActivePut() throws InterruptedException {
652	>	final SynchronousQueue q = new SynchronousQueue();
653	>	Thread t = new Thread(new CheckedRunnable() {
654	>	public void realRun() throws InterruptedException {
655	>	q.put(new Integer(1));
656	>	}});
657	>
658	>	t.start();
659	>	ArrayList l = new ArrayList();
660	>	Thread.sleep(SHORT_DELAY_MS);
661	>	q.drainTo(l);
662	>	assertTrue(l.size() <= 1);
663	>	if (l.size() > 0)
664	>	assertEquals(l.get(0), new Integer(1));
665	>	t.join();
666	>	assertTrue(l.size() <= 1);
667	>	}
668	>
669	>	/**
670	>	* drainTo(null, n) throws NPE
671	>	*/
672	>	public void testDrainToNullN() {
673	>	SynchronousQueue q = new SynchronousQueue();
674	>	try {
675	>	q.drainTo(null, 0);
676	>	shouldThrow();
677	>	} catch (NullPointerException success) {}
678	>	}
679	>
680	>	/**
681	>	* drainTo(this, n) throws IAE
682	>	*/
683	>	public void testDrainToSelfN() {
684	>	SynchronousQueue q = new SynchronousQueue();
685	>	try {
686	>	q.drainTo(q, 0);
687	>	shouldThrow();
688	>	} catch (IllegalArgumentException success) {}
689	>	}
690	>
691	>	/**
692	>	* drainTo(c, n) empties up to n elements of queue into c
693	>	*/
694	>	public void testDrainToN() throws InterruptedException {
695	>	final SynchronousQueue q = new SynchronousQueue();
696	>	Thread t1 = new Thread(new CheckedRunnable() {
697	>	public void realRun() throws InterruptedException {
698	>	q.put(one);
699	>	}});
700	>
701	>	Thread t2 = new Thread(new CheckedRunnable() {
702	>	public void realRun() throws InterruptedException {
703	>	q.put(two);
704	>	}});
705	>
706	>	t1.start();
707	>	t2.start();
708	>	ArrayList l = new ArrayList();
709	>	Thread.sleep(SHORT_DELAY_MS);
710	>	q.drainTo(l, 1);
711	>	assertEquals(1, l.size());
712	>	q.drainTo(l, 1);
713	>	assertEquals(2, l.size());
714	>	assertTrue(l.contains(one));
715	>	assertTrue(l.contains(two));
716	>	t1.join();
717	>	t2.join();
718		}
719
720		}

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