1 |
/* |
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/ |
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* Other contributors include Andrew Wright, Jeffrey Hayes, |
6 |
* Pat Fisher, Mike Judd. |
7 |
*/ |
8 |
|
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import junit.framework.*; |
10 |
import java.util.Arrays; |
11 |
import java.util.Collection; |
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import java.util.Deque; |
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import java.util.Iterator; |
14 |
import java.util.NoSuchElementException; |
15 |
import java.util.Queue; |
16 |
import java.util.Random; |
17 |
import java.util.concurrent.ConcurrentLinkedDeque; |
18 |
|
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public class ConcurrentLinkedDequeTest extends JSR166TestCase { |
20 |
|
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public static void main(String[] args) { |
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junit.textui.TestRunner.run(suite()); |
23 |
} |
24 |
|
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public static Test suite() { |
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return new TestSuite(ConcurrentLinkedDequeTest.class); |
27 |
} |
28 |
|
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/** |
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* Returns a new deque of given size containing consecutive |
31 |
* Integers 0 ... n. |
32 |
*/ |
33 |
private ConcurrentLinkedDeque<Integer> populatedDeque(int n) { |
34 |
ConcurrentLinkedDeque<Integer> q = new ConcurrentLinkedDeque<Integer>(); |
35 |
assertTrue(q.isEmpty()); |
36 |
for (int i = 0; i < n; ++i) |
37 |
assertTrue(q.offer(new Integer(i))); |
38 |
assertFalse(q.isEmpty()); |
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assertEquals(n, q.size()); |
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return q; |
41 |
} |
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|
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/** |
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* new deque is empty |
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*/ |
46 |
public void testConstructor1() { |
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assertTrue(new ConcurrentLinkedDeque().isEmpty()); |
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assertEquals(0, new ConcurrentLinkedDeque().size()); |
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} |
50 |
|
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/** |
52 |
* Initializing from null Collection throws NPE |
53 |
*/ |
54 |
public void testConstructor3() { |
55 |
try { |
56 |
ConcurrentLinkedDeque q = new ConcurrentLinkedDeque((Collection)null); |
57 |
shouldThrow(); |
58 |
} catch (NullPointerException success) {} |
59 |
} |
60 |
|
61 |
/** |
62 |
* Initializing from Collection of null elements throws NPE |
63 |
*/ |
64 |
public void testConstructor4() { |
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try { |
66 |
Integer[] ints = new Integer[SIZE]; |
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ConcurrentLinkedDeque q = new ConcurrentLinkedDeque(Arrays.asList(ints)); |
68 |
shouldThrow(); |
69 |
} catch (NullPointerException success) {} |
70 |
} |
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|
72 |
/** |
73 |
* Initializing from Collection with some null elements throws NPE |
74 |
*/ |
75 |
public void testConstructor5() { |
76 |
try { |
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Integer[] ints = new Integer[SIZE]; |
78 |
for (int i = 0; i < SIZE-1; ++i) |
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ints[i] = new Integer(i); |
80 |
ConcurrentLinkedDeque q = new ConcurrentLinkedDeque(Arrays.asList(ints)); |
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shouldThrow(); |
82 |
} catch (NullPointerException success) {} |
83 |
} |
84 |
|
85 |
/** |
86 |
* Deque contains all elements of collection used to initialize |
87 |
*/ |
88 |
public void testConstructor6() { |
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Integer[] ints = new Integer[SIZE]; |
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for (int i = 0; i < SIZE; ++i) |
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ints[i] = new Integer(i); |
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ConcurrentLinkedDeque q = new ConcurrentLinkedDeque(Arrays.asList(ints)); |
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for (int i = 0; i < SIZE; ++i) |
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assertEquals(ints[i], q.poll()); |
95 |
} |
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|
97 |
/** |
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* isEmpty is true before add, false after |
99 |
*/ |
100 |
public void testEmpty() { |
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ConcurrentLinkedDeque q = new ConcurrentLinkedDeque(); |
102 |
assertTrue(q.isEmpty()); |
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q.add(one); |
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assertFalse(q.isEmpty()); |
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q.add(two); |
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q.remove(); |
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q.remove(); |
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assertTrue(q.isEmpty()); |
109 |
} |
110 |
|
111 |
/** |
112 |
* size() changes when elements added and removed |
113 |
*/ |
114 |
public void testSize() { |
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ConcurrentLinkedDeque q = populatedDeque(SIZE); |
116 |
for (int i = 0; i < SIZE; ++i) { |
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assertEquals(SIZE-i, q.size()); |
118 |
q.remove(); |
119 |
} |
120 |
for (int i = 0; i < SIZE; ++i) { |
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assertEquals(i, q.size()); |
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q.add(new Integer(i)); |
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} |
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} |
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|
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/** |
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* push(null) throws NPE |
128 |
*/ |
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public void testPushNull() { |
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try { |
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ConcurrentLinkedDeque q = new ConcurrentLinkedDeque(); |
132 |
q.push(null); |
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shouldThrow(); |
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} catch (NullPointerException success) {} |
135 |
} |
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|
137 |
/** |
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* peekFirst() returns element inserted with push |
139 |
*/ |
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public void testPush() { |
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ConcurrentLinkedDeque q = populatedDeque(3); |
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q.pollLast(); |
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q.push(four); |
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assertSame(four, q.peekFirst()); |
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} |
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|
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/** |
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* pop() removes first element, or throws NSEE if empty |
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*/ |
150 |
public void testPop() { |
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ConcurrentLinkedDeque q = populatedDeque(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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assertEquals(i, q.pop()); |
154 |
} |
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try { |
156 |
q.pop(); |
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shouldThrow(); |
158 |
} catch (NoSuchElementException success) {} |
159 |
} |
160 |
|
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/** |
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* offer(null) throws NPE |
163 |
*/ |
164 |
public void testOfferNull() { |
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try { |
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ConcurrentLinkedDeque q = new ConcurrentLinkedDeque(); |
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q.offer(null); |
168 |
shouldThrow(); |
169 |
} catch (NullPointerException success) {} |
170 |
} |
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|
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/** |
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* offerFirst(null) throws NPE |
174 |
*/ |
175 |
public void testOfferFirstNull() { |
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try { |
177 |
ConcurrentLinkedDeque q = new ConcurrentLinkedDeque(); |
178 |
q.offerFirst(null); |
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shouldThrow(); |
180 |
} catch (NullPointerException success) {} |
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} |
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|
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/** |
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* offerLast(null) throws NPE |
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*/ |
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public void testOfferLastNull() { |
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try { |
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ConcurrentLinkedDeque q = new ConcurrentLinkedDeque(); |
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q.offerLast(null); |
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shouldThrow(); |
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} catch (NullPointerException success) {} |
192 |
} |
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|
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/** |
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* offer(x) succeeds |
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*/ |
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public void testOffer() { |
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ConcurrentLinkedDeque q = new ConcurrentLinkedDeque(); |
199 |
assertTrue(q.offer(zero)); |
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assertTrue(q.offer(one)); |
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assertSame(zero, q.peekFirst()); |
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assertSame(one, q.peekLast()); |
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} |
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|
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/** |
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* offerFirst(x) succeeds |
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*/ |
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public void testOfferFirst() { |
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ConcurrentLinkedDeque q = new ConcurrentLinkedDeque(); |
210 |
assertTrue(q.offerFirst(zero)); |
211 |
assertTrue(q.offerFirst(one)); |
212 |
assertSame(one, q.peekFirst()); |
213 |
assertSame(zero, q.peekLast()); |
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} |
215 |
|
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/** |
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* offerLast(x) succeeds |
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*/ |
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public void testOfferLast() { |
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ConcurrentLinkedDeque q = new ConcurrentLinkedDeque(); |
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assertTrue(q.offerLast(zero)); |
222 |
assertTrue(q.offerLast(one)); |
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assertSame(zero, q.peekFirst()); |
224 |
assertSame(one, q.peekLast()); |
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} |
226 |
|
227 |
/** |
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* add(null) throws NPE |
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*/ |
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public void testAddNull() { |
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try { |
232 |
ConcurrentLinkedDeque q = new ConcurrentLinkedDeque(); |
233 |
q.add(null); |
234 |
shouldThrow(); |
235 |
} catch (NullPointerException success) {} |
236 |
} |
237 |
|
238 |
/** |
239 |
* addFirst(null) throws NPE |
240 |
*/ |
241 |
public void testAddFirstNull() { |
242 |
try { |
243 |
ConcurrentLinkedDeque q = new ConcurrentLinkedDeque(); |
244 |
q.addFirst(null); |
245 |
shouldThrow(); |
246 |
} catch (NullPointerException success) {} |
247 |
} |
248 |
|
249 |
/** |
250 |
* addLast(null) throws NPE |
251 |
*/ |
252 |
public void testAddLastNull() { |
253 |
try { |
254 |
ConcurrentLinkedDeque q = new ConcurrentLinkedDeque(); |
255 |
q.addLast(null); |
256 |
shouldThrow(); |
257 |
} catch (NullPointerException success) {} |
258 |
} |
259 |
|
260 |
/** |
261 |
* add(x) succeeds |
262 |
*/ |
263 |
public void testAdd() { |
264 |
ConcurrentLinkedDeque q = new ConcurrentLinkedDeque(); |
265 |
assertTrue(q.add(zero)); |
266 |
assertTrue(q.add(one)); |
267 |
assertSame(zero, q.peekFirst()); |
268 |
assertSame(one, q.peekLast()); |
269 |
} |
270 |
|
271 |
/** |
272 |
* addFirst(x) succeeds |
273 |
*/ |
274 |
public void testAddFirst() { |
275 |
ConcurrentLinkedDeque q = new ConcurrentLinkedDeque(); |
276 |
q.addFirst(zero); |
277 |
q.addFirst(one); |
278 |
assertSame(one, q.peekFirst()); |
279 |
assertSame(zero, q.peekLast()); |
280 |
} |
281 |
|
282 |
/** |
283 |
* addLast(x) succeeds |
284 |
*/ |
285 |
public void testAddLast() { |
286 |
ConcurrentLinkedDeque q = new ConcurrentLinkedDeque(); |
287 |
q.addLast(zero); |
288 |
q.addLast(one); |
289 |
assertSame(zero, q.peekFirst()); |
290 |
assertSame(one, q.peekLast()); |
291 |
} |
292 |
|
293 |
/** |
294 |
* addAll(null) throws NPE |
295 |
*/ |
296 |
public void testAddAll1() { |
297 |
try { |
298 |
ConcurrentLinkedDeque q = new ConcurrentLinkedDeque(); |
299 |
q.addAll(null); |
300 |
shouldThrow(); |
301 |
} catch (NullPointerException success) {} |
302 |
} |
303 |
|
304 |
/** |
305 |
* addAll(this) throws IAE |
306 |
*/ |
307 |
public void testAddAllSelf() { |
308 |
try { |
309 |
ConcurrentLinkedDeque q = populatedDeque(SIZE); |
310 |
q.addAll(q); |
311 |
shouldThrow(); |
312 |
} catch (IllegalArgumentException success) {} |
313 |
} |
314 |
|
315 |
/** |
316 |
* addAll of a collection with null elements throws NPE |
317 |
*/ |
318 |
public void testAddAll2() { |
319 |
try { |
320 |
ConcurrentLinkedDeque q = new ConcurrentLinkedDeque(); |
321 |
Integer[] ints = new Integer[SIZE]; |
322 |
q.addAll(Arrays.asList(ints)); |
323 |
shouldThrow(); |
324 |
} catch (NullPointerException success) {} |
325 |
} |
326 |
|
327 |
/** |
328 |
* addAll of a collection with any null elements throws NPE after |
329 |
* possibly adding some elements |
330 |
*/ |
331 |
public void testAddAll3() { |
332 |
try { |
333 |
ConcurrentLinkedDeque q = new ConcurrentLinkedDeque(); |
334 |
Integer[] ints = new Integer[SIZE]; |
335 |
for (int i = 0; i < SIZE-1; ++i) |
336 |
ints[i] = new Integer(i); |
337 |
q.addAll(Arrays.asList(ints)); |
338 |
shouldThrow(); |
339 |
} catch (NullPointerException success) {} |
340 |
} |
341 |
|
342 |
/** |
343 |
* Deque contains all elements, in traversal order, of successful addAll |
344 |
*/ |
345 |
public void testAddAll5() { |
346 |
Integer[] empty = new Integer[0]; |
347 |
Integer[] ints = new Integer[SIZE]; |
348 |
for (int i = 0; i < SIZE; ++i) |
349 |
ints[i] = new Integer(i); |
350 |
ConcurrentLinkedDeque q = new ConcurrentLinkedDeque(); |
351 |
assertFalse(q.addAll(Arrays.asList(empty))); |
352 |
assertTrue(q.addAll(Arrays.asList(ints))); |
353 |
for (int i = 0; i < SIZE; ++i) |
354 |
assertEquals(ints[i], q.poll()); |
355 |
} |
356 |
|
357 |
/** |
358 |
* pollFirst() succeeds unless empty |
359 |
*/ |
360 |
public void testPollFirst() { |
361 |
ConcurrentLinkedDeque q = populatedDeque(SIZE); |
362 |
for (int i = 0; i < SIZE; ++i) { |
363 |
assertEquals(i, q.pollFirst()); |
364 |
} |
365 |
assertNull(q.pollFirst()); |
366 |
} |
367 |
|
368 |
/** |
369 |
* pollLast() succeeds unless empty |
370 |
*/ |
371 |
public void testPollLast() { |
372 |
ConcurrentLinkedDeque q = populatedDeque(SIZE); |
373 |
for (int i = SIZE-1; i >= 0; --i) { |
374 |
assertEquals(i, q.pollLast()); |
375 |
} |
376 |
assertNull(q.pollLast()); |
377 |
} |
378 |
|
379 |
/** |
380 |
* poll() succeeds unless empty |
381 |
*/ |
382 |
public void testPoll() { |
383 |
ConcurrentLinkedDeque q = populatedDeque(SIZE); |
384 |
for (int i = 0; i < SIZE; ++i) { |
385 |
assertEquals(i, q.poll()); |
386 |
} |
387 |
assertNull(q.poll()); |
388 |
} |
389 |
|
390 |
/** |
391 |
* peek() returns next element, or null if empty |
392 |
*/ |
393 |
public void testPeek() { |
394 |
ConcurrentLinkedDeque q = populatedDeque(SIZE); |
395 |
for (int i = 0; i < SIZE; ++i) { |
396 |
assertEquals(i, q.peek()); |
397 |
assertEquals(i, q.poll()); |
398 |
assertTrue(q.peek() == null || |
399 |
!q.peek().equals(i)); |
400 |
} |
401 |
assertNull(q.peek()); |
402 |
} |
403 |
|
404 |
/** |
405 |
* element() returns first element, or throws NSEE if empty |
406 |
*/ |
407 |
public void testElement() { |
408 |
ConcurrentLinkedDeque q = populatedDeque(SIZE); |
409 |
for (int i = 0; i < SIZE; ++i) { |
410 |
assertEquals(i, q.element()); |
411 |
assertEquals(i, q.poll()); |
412 |
} |
413 |
try { |
414 |
q.element(); |
415 |
shouldThrow(); |
416 |
} catch (NoSuchElementException success) {} |
417 |
} |
418 |
|
419 |
/** |
420 |
* remove() removes next element, or throws NSEE if empty |
421 |
*/ |
422 |
public void testRemove() { |
423 |
ConcurrentLinkedDeque q = populatedDeque(SIZE); |
424 |
for (int i = 0; i < SIZE; ++i) { |
425 |
assertEquals(i, q.remove()); |
426 |
} |
427 |
try { |
428 |
q.remove(); |
429 |
shouldThrow(); |
430 |
} catch (NoSuchElementException success) {} |
431 |
} |
432 |
|
433 |
/** |
434 |
* remove(x) removes x and returns true if present |
435 |
*/ |
436 |
public void testRemoveElement() { |
437 |
ConcurrentLinkedDeque q = populatedDeque(SIZE); |
438 |
for (int i = 1; i < SIZE; i+=2) { |
439 |
assertTrue(q.contains(i)); |
440 |
assertTrue(q.remove(i)); |
441 |
assertFalse(q.contains(i)); |
442 |
assertTrue(q.contains(i-1)); |
443 |
} |
444 |
for (int i = 0; i < SIZE; i+=2) { |
445 |
assertTrue(q.contains(i)); |
446 |
assertTrue(q.remove(i)); |
447 |
assertFalse(q.contains(i)); |
448 |
assertFalse(q.remove(i+1)); |
449 |
assertFalse(q.contains(i+1)); |
450 |
} |
451 |
assertTrue(q.isEmpty()); |
452 |
} |
453 |
|
454 |
/** |
455 |
* peekFirst() returns next element, or null if empty |
456 |
*/ |
457 |
public void testPeekFirst() { |
458 |
ConcurrentLinkedDeque q = populatedDeque(SIZE); |
459 |
for (int i = 0; i < SIZE; ++i) { |
460 |
assertEquals(i, q.peekFirst()); |
461 |
assertEquals(i, q.pollFirst()); |
462 |
assertTrue(q.peekFirst() == null || |
463 |
!q.peekFirst().equals(i)); |
464 |
} |
465 |
assertNull(q.peekFirst()); |
466 |
} |
467 |
|
468 |
/** |
469 |
* peekLast() returns next element, or null if empty |
470 |
*/ |
471 |
public void testPeekLast() { |
472 |
ConcurrentLinkedDeque q = populatedDeque(SIZE); |
473 |
for (int i = SIZE-1; i >= 0; --i) { |
474 |
assertEquals(i, q.peekLast()); |
475 |
assertEquals(i, q.pollLast()); |
476 |
assertTrue(q.peekLast() == null || |
477 |
!q.peekLast().equals(i)); |
478 |
} |
479 |
assertNull(q.peekLast()); |
480 |
} |
481 |
|
482 |
/** |
483 |
* getFirst() returns first element, or throws NSEE if empty |
484 |
*/ |
485 |
public void testFirstElement() { |
486 |
ConcurrentLinkedDeque q = populatedDeque(SIZE); |
487 |
for (int i = 0; i < SIZE; ++i) { |
488 |
assertEquals(i, q.getFirst()); |
489 |
assertEquals(i, q.pollFirst()); |
490 |
} |
491 |
try { |
492 |
q.getFirst(); |
493 |
shouldThrow(); |
494 |
} catch (NoSuchElementException success) {} |
495 |
} |
496 |
|
497 |
/** |
498 |
* getLast() returns last element, or throws NSEE if empty |
499 |
*/ |
500 |
public void testLastElement() { |
501 |
ConcurrentLinkedDeque q = populatedDeque(SIZE); |
502 |
for (int i = SIZE-1; i >= 0; --i) { |
503 |
assertEquals(i, q.getLast()); |
504 |
assertEquals(i, q.pollLast()); |
505 |
} |
506 |
try { |
507 |
q.getLast(); |
508 |
shouldThrow(); |
509 |
} catch (NoSuchElementException success) {} |
510 |
assertNull(q.peekLast()); |
511 |
} |
512 |
|
513 |
/** |
514 |
* removeFirst() removes first element, or throws NSEE if empty |
515 |
*/ |
516 |
public void testRemoveFirst() { |
517 |
ConcurrentLinkedDeque q = populatedDeque(SIZE); |
518 |
for (int i = 0; i < SIZE; ++i) { |
519 |
assertEquals(i, q.removeFirst()); |
520 |
} |
521 |
try { |
522 |
q.removeFirst(); |
523 |
shouldThrow(); |
524 |
} catch (NoSuchElementException success) {} |
525 |
assertNull(q.peekFirst()); |
526 |
} |
527 |
|
528 |
/** |
529 |
* removeLast() removes last element, or throws NSEE if empty |
530 |
*/ |
531 |
public void testRemoveLast() { |
532 |
ConcurrentLinkedDeque q = populatedDeque(SIZE); |
533 |
for (int i = SIZE - 1; i >= 0; --i) { |
534 |
assertEquals(i, q.removeLast()); |
535 |
} |
536 |
try { |
537 |
q.removeLast(); |
538 |
shouldThrow(); |
539 |
} catch (NoSuchElementException success) {} |
540 |
assertNull(q.peekLast()); |
541 |
} |
542 |
|
543 |
/** |
544 |
* removeFirstOccurrence(x) removes x and returns true if present |
545 |
*/ |
546 |
public void testRemoveFirstOccurrence() { |
547 |
ConcurrentLinkedDeque q = populatedDeque(SIZE); |
548 |
for (int i = 1; i < SIZE; i+=2) { |
549 |
assertTrue(q.removeFirstOccurrence(new Integer(i))); |
550 |
} |
551 |
for (int i = 0; i < SIZE; i+=2) { |
552 |
assertTrue(q.removeFirstOccurrence(new Integer(i))); |
553 |
assertFalse(q.removeFirstOccurrence(new Integer(i+1))); |
554 |
} |
555 |
assertTrue(q.isEmpty()); |
556 |
} |
557 |
|
558 |
/** |
559 |
* removeLastOccurrence(x) removes x and returns true if present |
560 |
*/ |
561 |
public void testRemoveLastOccurrence() { |
562 |
ConcurrentLinkedDeque q = populatedDeque(SIZE); |
563 |
for (int i = 1; i < SIZE; i+=2) { |
564 |
assertTrue(q.removeLastOccurrence(new Integer(i))); |
565 |
} |
566 |
for (int i = 0; i < SIZE; i+=2) { |
567 |
assertTrue(q.removeLastOccurrence(new Integer(i))); |
568 |
assertFalse(q.removeLastOccurrence(new Integer(i+1))); |
569 |
} |
570 |
assertTrue(q.isEmpty()); |
571 |
} |
572 |
|
573 |
/** |
574 |
* contains(x) reports true when elements added but not yet removed |
575 |
*/ |
576 |
public void testContains() { |
577 |
ConcurrentLinkedDeque q = populatedDeque(SIZE); |
578 |
for (int i = 0; i < SIZE; ++i) { |
579 |
assertTrue(q.contains(new Integer(i))); |
580 |
q.poll(); |
581 |
assertFalse(q.contains(new Integer(i))); |
582 |
} |
583 |
} |
584 |
|
585 |
/** |
586 |
* clear() removes all elements |
587 |
*/ |
588 |
public void testClear() { |
589 |
ConcurrentLinkedDeque q = populatedDeque(SIZE); |
590 |
q.clear(); |
591 |
assertTrue(q.isEmpty()); |
592 |
assertEquals(0, q.size()); |
593 |
q.add(one); |
594 |
assertFalse(q.isEmpty()); |
595 |
q.clear(); |
596 |
assertTrue(q.isEmpty()); |
597 |
} |
598 |
|
599 |
/** |
600 |
* containsAll(c) is true when c contains a subset of elements |
601 |
*/ |
602 |
public void testContainsAll() { |
603 |
ConcurrentLinkedDeque q = populatedDeque(SIZE); |
604 |
ConcurrentLinkedDeque p = new ConcurrentLinkedDeque(); |
605 |
for (int i = 0; i < SIZE; ++i) { |
606 |
assertTrue(q.containsAll(p)); |
607 |
assertFalse(p.containsAll(q)); |
608 |
p.add(new Integer(i)); |
609 |
} |
610 |
assertTrue(p.containsAll(q)); |
611 |
} |
612 |
|
613 |
/** |
614 |
* retainAll(c) retains only those elements of c and reports true if change |
615 |
*/ |
616 |
public void testRetainAll() { |
617 |
ConcurrentLinkedDeque q = populatedDeque(SIZE); |
618 |
ConcurrentLinkedDeque p = populatedDeque(SIZE); |
619 |
for (int i = 0; i < SIZE; ++i) { |
620 |
boolean changed = q.retainAll(p); |
621 |
if (i == 0) |
622 |
assertFalse(changed); |
623 |
else |
624 |
assertTrue(changed); |
625 |
|
626 |
assertTrue(q.containsAll(p)); |
627 |
assertEquals(SIZE-i, q.size()); |
628 |
p.remove(); |
629 |
} |
630 |
} |
631 |
|
632 |
/** |
633 |
* removeAll(c) removes only those elements of c and reports true if changed |
634 |
*/ |
635 |
public void testRemoveAll() { |
636 |
for (int i = 1; i < SIZE; ++i) { |
637 |
ConcurrentLinkedDeque q = populatedDeque(SIZE); |
638 |
ConcurrentLinkedDeque p = populatedDeque(i); |
639 |
assertTrue(q.removeAll(p)); |
640 |
assertEquals(SIZE-i, q.size()); |
641 |
for (int j = 0; j < i; ++j) { |
642 |
Integer I = (Integer)(p.remove()); |
643 |
assertFalse(q.contains(I)); |
644 |
} |
645 |
} |
646 |
} |
647 |
|
648 |
/** |
649 |
* toArray() contains all elements in FIFO order |
650 |
*/ |
651 |
public void testToArray() { |
652 |
ConcurrentLinkedDeque q = populatedDeque(SIZE); |
653 |
Object[] o = q.toArray(); |
654 |
for (int i = 0; i < o.length; i++) |
655 |
assertSame(o[i], q.poll()); |
656 |
} |
657 |
|
658 |
/** |
659 |
* toArray(a) contains all elements in FIFO order |
660 |
*/ |
661 |
public void testToArray2() { |
662 |
ConcurrentLinkedDeque<Integer> q = populatedDeque(SIZE); |
663 |
Integer[] ints = new Integer[SIZE]; |
664 |
Integer[] array = q.toArray(ints); |
665 |
assertSame(ints, array); |
666 |
for (int i = 0; i < ints.length; i++) |
667 |
assertSame(ints[i], q.poll()); |
668 |
} |
669 |
|
670 |
/** |
671 |
* toArray(null) throws NullPointerException |
672 |
*/ |
673 |
public void testToArray_NullArg() { |
674 |
ConcurrentLinkedDeque q = populatedDeque(SIZE); |
675 |
try { |
676 |
q.toArray(null); |
677 |
shouldThrow(); |
678 |
} catch (NullPointerException success) {} |
679 |
} |
680 |
|
681 |
/** |
682 |
* toArray(incompatible array type) throws ArrayStoreException |
683 |
*/ |
684 |
public void testToArray1_BadArg() { |
685 |
ConcurrentLinkedDeque q = populatedDeque(SIZE); |
686 |
try { |
687 |
q.toArray(new String[10]); |
688 |
shouldThrow(); |
689 |
} catch (ArrayStoreException success) {} |
690 |
} |
691 |
|
692 |
/** |
693 |
* Iterator iterates through all elements |
694 |
*/ |
695 |
public void testIterator() { |
696 |
ConcurrentLinkedDeque q = populatedDeque(SIZE); |
697 |
int i = 0; |
698 |
Iterator it = q.iterator(); |
699 |
while (it.hasNext()) { |
700 |
assertTrue(q.contains(it.next())); |
701 |
++i; |
702 |
} |
703 |
assertEquals(i, SIZE); |
704 |
} |
705 |
|
706 |
/** |
707 |
* Iterator ordering is FIFO |
708 |
*/ |
709 |
public void testIteratorOrdering() { |
710 |
final ConcurrentLinkedDeque q = new ConcurrentLinkedDeque(); |
711 |
q.add(one); |
712 |
q.add(two); |
713 |
q.add(three); |
714 |
|
715 |
int k = 0; |
716 |
for (Iterator it = q.iterator(); it.hasNext();) { |
717 |
assertEquals(++k, it.next()); |
718 |
} |
719 |
|
720 |
assertEquals(3, k); |
721 |
} |
722 |
|
723 |
/** |
724 |
* Modifications do not cause iterators to fail |
725 |
*/ |
726 |
public void testWeaklyConsistentIteration() { |
727 |
final ConcurrentLinkedDeque q = new ConcurrentLinkedDeque(); |
728 |
q.add(one); |
729 |
q.add(two); |
730 |
q.add(three); |
731 |
|
732 |
for (Iterator it = q.iterator(); it.hasNext();) { |
733 |
q.remove(); |
734 |
it.next(); |
735 |
} |
736 |
|
737 |
assertEquals("deque should be empty again", 0, q.size()); |
738 |
} |
739 |
|
740 |
/** |
741 |
* iterator.remove() removes current element |
742 |
*/ |
743 |
public void testIteratorRemove() { |
744 |
final ConcurrentLinkedDeque q = new ConcurrentLinkedDeque(); |
745 |
final Random rng = new Random(); |
746 |
for (int iters = 0; iters < 100; ++iters) { |
747 |
int max = rng.nextInt(5) + 2; |
748 |
int split = rng.nextInt(max-1) + 1; |
749 |
for (int j = 1; j <= max; ++j) |
750 |
q.add(new Integer(j)); |
751 |
Iterator it = q.iterator(); |
752 |
for (int j = 1; j <= split; ++j) |
753 |
assertEquals(it.next(), new Integer(j)); |
754 |
it.remove(); |
755 |
assertEquals(it.next(), new Integer(split+1)); |
756 |
for (int j = 1; j <= split; ++j) |
757 |
q.remove(new Integer(j)); |
758 |
it = q.iterator(); |
759 |
for (int j = split+1; j <= max; ++j) { |
760 |
assertEquals(it.next(), new Integer(j)); |
761 |
it.remove(); |
762 |
} |
763 |
assertFalse(it.hasNext()); |
764 |
assertTrue(q.isEmpty()); |
765 |
} |
766 |
} |
767 |
|
768 |
/** |
769 |
* Descending iterator iterates through all elements |
770 |
*/ |
771 |
public void testDescendingIterator() { |
772 |
ConcurrentLinkedDeque q = populatedDeque(SIZE); |
773 |
int i = 0; |
774 |
Iterator it = q.descendingIterator(); |
775 |
while (it.hasNext()) { |
776 |
assertTrue(q.contains(it.next())); |
777 |
++i; |
778 |
} |
779 |
assertEquals(i, SIZE); |
780 |
assertFalse(it.hasNext()); |
781 |
try { |
782 |
it.next(); |
783 |
shouldThrow(); |
784 |
} catch (NoSuchElementException success) {} |
785 |
} |
786 |
|
787 |
/** |
788 |
* Descending iterator ordering is reverse FIFO |
789 |
*/ |
790 |
public void testDescendingIteratorOrdering() { |
791 |
final ConcurrentLinkedDeque q = new ConcurrentLinkedDeque(); |
792 |
for (int iters = 0; iters < 100; ++iters) { |
793 |
q.add(new Integer(3)); |
794 |
q.add(new Integer(2)); |
795 |
q.add(new Integer(1)); |
796 |
int k = 0; |
797 |
for (Iterator it = q.descendingIterator(); it.hasNext();) { |
798 |
assertEquals(++k, it.next()); |
799 |
} |
800 |
|
801 |
assertEquals(3, k); |
802 |
q.remove(); |
803 |
q.remove(); |
804 |
q.remove(); |
805 |
} |
806 |
} |
807 |
|
808 |
/** |
809 |
* descendingIterator.remove() removes current element |
810 |
*/ |
811 |
public void testDescendingIteratorRemove() { |
812 |
final ConcurrentLinkedDeque q = new ConcurrentLinkedDeque(); |
813 |
final Random rng = new Random(); |
814 |
for (int iters = 0; iters < 100; ++iters) { |
815 |
int max = rng.nextInt(5) + 2; |
816 |
int split = rng.nextInt(max-1) + 1; |
817 |
for (int j = max; j >= 1; --j) |
818 |
q.add(new Integer(j)); |
819 |
Iterator it = q.descendingIterator(); |
820 |
for (int j = 1; j <= split; ++j) |
821 |
assertEquals(it.next(), new Integer(j)); |
822 |
it.remove(); |
823 |
assertEquals(it.next(), new Integer(split+1)); |
824 |
for (int j = 1; j <= split; ++j) |
825 |
q.remove(new Integer(j)); |
826 |
it = q.descendingIterator(); |
827 |
for (int j = split+1; j <= max; ++j) { |
828 |
assertEquals(it.next(), new Integer(j)); |
829 |
it.remove(); |
830 |
} |
831 |
assertFalse(it.hasNext()); |
832 |
assertTrue(q.isEmpty()); |
833 |
} |
834 |
} |
835 |
|
836 |
/** |
837 |
* toString() contains toStrings of elements |
838 |
*/ |
839 |
public void testToString() { |
840 |
ConcurrentLinkedDeque q = populatedDeque(SIZE); |
841 |
String s = q.toString(); |
842 |
for (int i = 0; i < SIZE; ++i) { |
843 |
assertTrue(s.contains(String.valueOf(i))); |
844 |
} |
845 |
} |
846 |
|
847 |
/** |
848 |
* A deserialized serialized deque has same elements in same order |
849 |
*/ |
850 |
public void testSerialization() throws Exception { |
851 |
Queue x = populatedDeque(SIZE); |
852 |
Queue y = serialClone(x); |
853 |
|
854 |
assertNotSame(x, y); |
855 |
assertEquals(x.size(), y.size()); |
856 |
assertEquals(x.toString(), y.toString()); |
857 |
assertTrue(Arrays.equals(x.toArray(), y.toArray())); |
858 |
while (!x.isEmpty()) { |
859 |
assertFalse(y.isEmpty()); |
860 |
assertEquals(x.remove(), y.remove()); |
861 |
} |
862 |
assertTrue(y.isEmpty()); |
863 |
} |
864 |
|
865 |
/** |
866 |
* contains(null) always return false. |
867 |
* remove(null) always throws NullPointerException. |
868 |
*/ |
869 |
public void testNeverContainsNull() { |
870 |
Deque<?>[] qs = { |
871 |
new ConcurrentLinkedDeque<Object>(), |
872 |
populatedDeque(2), |
873 |
}; |
874 |
|
875 |
for (Deque<?> q : qs) { |
876 |
assertFalse(q.contains(null)); |
877 |
try { |
878 |
assertFalse(q.remove(null)); |
879 |
shouldThrow(); |
880 |
} catch (NullPointerException success) {} |
881 |
try { |
882 |
assertFalse(q.removeFirstOccurrence(null)); |
883 |
shouldThrow(); |
884 |
} catch (NullPointerException success) {} |
885 |
try { |
886 |
assertFalse(q.removeLastOccurrence(null)); |
887 |
shouldThrow(); |
888 |
} catch (NullPointerException success) {} |
889 |
} |
890 |
} |
891 |
} |