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/ |
5 |
* Other contributors include John Vint |
6 |
*/ |
7 |
|
8 |
import junit.framework.*; |
9 |
import java.util.ArrayList; |
10 |
import java.util.List; |
11 |
import java.util.concurrent.Phaser; |
12 |
import java.util.concurrent.CountDownLatch; |
13 |
import java.util.concurrent.TimeoutException; |
14 |
import static java.util.concurrent.TimeUnit.MILLISECONDS; |
15 |
import static java.util.concurrent.TimeUnit.NANOSECONDS; |
16 |
import java.util.concurrent.atomic.AtomicBoolean; |
17 |
import java.util.concurrent.atomic.AtomicInteger; |
18 |
|
19 |
public class PhaserTest extends JSR166TestCase { |
20 |
|
21 |
public static void main(String[] args) { |
22 |
junit.textui.TestRunner.run(suite()); |
23 |
} |
24 |
|
25 |
public static Test suite() { |
26 |
return new TestSuite(PhaserTest.class); |
27 |
} |
28 |
|
29 |
private static final int maxParties = 65535; |
30 |
|
31 |
/** Checks state of unterminated phaser. */ |
32 |
protected void assertState(Phaser phaser, |
33 |
int phase, int parties, int unarrived) { |
34 |
assertEquals(phase, phaser.getPhase()); |
35 |
assertEquals(parties, phaser.getRegisteredParties()); |
36 |
assertEquals(unarrived, phaser.getUnarrivedParties()); |
37 |
assertEquals(parties - unarrived, phaser.getArrivedParties()); |
38 |
assertFalse(phaser.isTerminated()); |
39 |
} |
40 |
|
41 |
/** Checks state of terminated phaser. */ |
42 |
protected void assertTerminated(Phaser phaser, int maxPhase, int parties) { |
43 |
assertTrue(phaser.isTerminated()); |
44 |
int expectedPhase = maxPhase + Integer.MIN_VALUE; |
45 |
assertEquals(expectedPhase, phaser.getPhase()); |
46 |
assertEquals(parties, phaser.getRegisteredParties()); |
47 |
assertEquals(expectedPhase, phaser.register()); |
48 |
assertEquals(expectedPhase, phaser.arrive()); |
49 |
assertEquals(expectedPhase, phaser.arriveAndDeregister()); |
50 |
} |
51 |
|
52 |
protected void assertTerminated(Phaser phaser, int maxPhase) { |
53 |
assertTerminated(phaser, maxPhase, 0); |
54 |
} |
55 |
|
56 |
/** |
57 |
* Empty constructor builds a new Phaser with no parent, no registered |
58 |
* parties and initial phase number of 0 |
59 |
*/ |
60 |
public void testConstructorDefaultValues() { |
61 |
Phaser phaser = new Phaser(); |
62 |
assertNull(phaser.getParent()); |
63 |
assertEquals(0, phaser.getRegisteredParties()); |
64 |
assertEquals(0, phaser.getArrivedParties()); |
65 |
assertEquals(0, phaser.getUnarrivedParties()); |
66 |
assertEquals(0, phaser.getPhase()); |
67 |
} |
68 |
|
69 |
/** |
70 |
* Constructing with a negative number of parties throws |
71 |
* IllegalArgumentException |
72 |
*/ |
73 |
public void testConstructorNegativeParties() { |
74 |
try { |
75 |
new Phaser(-1); |
76 |
shouldThrow(); |
77 |
} catch (IllegalArgumentException success) {} |
78 |
} |
79 |
|
80 |
/** |
81 |
* Constructing with a negative number of parties throws |
82 |
* IllegalArgumentException |
83 |
*/ |
84 |
public void testConstructorNegativeParties2() { |
85 |
try { |
86 |
new Phaser(new Phaser(), -1); |
87 |
shouldThrow(); |
88 |
} catch (IllegalArgumentException success) {} |
89 |
} |
90 |
|
91 |
/** |
92 |
* Constructing with a number of parties > 65535 throws |
93 |
* IllegalArgumentException |
94 |
*/ |
95 |
public void testConstructorPartiesExceedsLimit() { |
96 |
new Phaser(maxParties); |
97 |
try { |
98 |
new Phaser(maxParties + 1); |
99 |
shouldThrow(); |
100 |
} catch (IllegalArgumentException success) {} |
101 |
|
102 |
new Phaser(new Phaser(), maxParties); |
103 |
try { |
104 |
new Phaser(new Phaser(), maxParties + 1); |
105 |
shouldThrow(); |
106 |
} catch (IllegalArgumentException success) {} |
107 |
} |
108 |
|
109 |
/** |
110 |
* The parent provided to the constructor should be returned from |
111 |
* a later call to getParent |
112 |
*/ |
113 |
public void testConstructor3() { |
114 |
Phaser parent = new Phaser(); |
115 |
assertSame(parent, new Phaser(parent).getParent()); |
116 |
assertNull(new Phaser(null).getParent()); |
117 |
} |
118 |
|
119 |
/** |
120 |
* The parent being input into the parameter should equal the original |
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* parent when being returned |
122 |
*/ |
123 |
public void testConstructor5() { |
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Phaser parent = new Phaser(); |
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assertSame(parent, new Phaser(parent, 0).getParent()); |
126 |
assertNull(new Phaser(null, 0).getParent()); |
127 |
} |
128 |
|
129 |
/** |
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* register() will increment the number of unarrived parties by |
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* one and not affect its arrived parties |
132 |
*/ |
133 |
public void testRegister1() { |
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Phaser phaser = new Phaser(); |
135 |
assertState(phaser, 0, 0, 0); |
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assertEquals(0, phaser.register()); |
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assertState(phaser, 0, 1, 1); |
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} |
139 |
|
140 |
/** |
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* Registering more than 65536 parties causes IllegalStateException |
142 |
*/ |
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public void testRegister2() { |
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Phaser phaser = new Phaser(0); |
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assertState(phaser, 0, 0, 0); |
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assertEquals(0, phaser.bulkRegister(maxParties - 10)); |
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assertState(phaser, 0, maxParties - 10, maxParties - 10); |
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for (int i = 0; i < 10; i++) { |
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assertState(phaser, 0, maxParties - 10 + i, maxParties - 10 + i); |
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assertEquals(0, phaser.register()); |
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} |
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assertState(phaser, 0, maxParties, maxParties); |
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try { |
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phaser.register(); |
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shouldThrow(); |
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} catch (IllegalStateException success) {} |
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|
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try { |
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phaser.bulkRegister(Integer.MAX_VALUE); |
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shouldThrow(); |
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} catch (IllegalStateException success) {} |
162 |
|
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assertEquals(0, phaser.bulkRegister(0)); |
164 |
assertState(phaser, 0, maxParties, maxParties); |
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} |
166 |
|
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/** |
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* register() correctly returns the current barrier phase number |
169 |
* when invoked |
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*/ |
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public void testRegister3() { |
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Phaser phaser = new Phaser(); |
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assertEquals(0, phaser.register()); |
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assertEquals(0, phaser.arrive()); |
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assertEquals(1, phaser.register()); |
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assertState(phaser, 1, 2, 2); |
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} |
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|
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/** |
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* register causes the next arrive to not increment the phase |
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* rather retain the phase number |
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*/ |
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public void testRegister4() { |
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Phaser phaser = new Phaser(1); |
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assertEquals(0, phaser.arrive()); |
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assertEquals(1, phaser.register()); |
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assertEquals(1, phaser.arrive()); |
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assertState(phaser, 1, 2, 1); |
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} |
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|
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/** |
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* register on a subphaser that is currently empty succeeds, even |
193 |
* in the presence of another non-empty subphaser |
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*/ |
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public void testRegisterEmptySubPhaser() { |
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Phaser root = new Phaser(); |
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Phaser child1 = new Phaser(root, 1); |
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Phaser child2 = new Phaser(root, 0); |
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assertEquals(0, child2.register()); |
200 |
assertState(root, 0, 2, 2); |
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assertState(child1, 0, 1, 1); |
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assertState(child2, 0, 1, 1); |
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assertEquals(0, child2.arriveAndDeregister()); |
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assertState(root, 0, 1, 1); |
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assertState(child1, 0, 1, 1); |
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assertState(child2, 0, 0, 0); |
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assertEquals(0, child2.register()); |
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assertEquals(0, child2.arriveAndDeregister()); |
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assertState(root, 0, 1, 1); |
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assertState(child1, 0, 1, 1); |
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assertState(child2, 0, 0, 0); |
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assertEquals(0, child1.arriveAndDeregister()); |
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assertTerminated(root, 1); |
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assertTerminated(child1, 1); |
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assertTerminated(child2, 1); |
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} |
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|
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/** |
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* Invoking bulkRegister with a negative parameter throws an |
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* IllegalArgumentException |
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*/ |
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public void testBulkRegister1() { |
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try { |
224 |
new Phaser().bulkRegister(-1); |
225 |
shouldThrow(); |
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} catch (IllegalArgumentException success) {} |
227 |
} |
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|
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/** |
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* bulkRegister should correctly record the number of unarrived |
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* parties with the number of parties being registered |
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*/ |
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public void testBulkRegister2() { |
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Phaser phaser = new Phaser(); |
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assertEquals(0, phaser.bulkRegister(0)); |
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assertState(phaser, 0, 0, 0); |
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assertEquals(0, phaser.bulkRegister(20)); |
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assertState(phaser, 0, 20, 20); |
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} |
240 |
|
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/** |
242 |
* Registering with a number of parties greater than or equal to 1<<16 |
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* throws IllegalStateException. |
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*/ |
245 |
public void testBulkRegister3() { |
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assertEquals(0, new Phaser().bulkRegister((1 << 16) - 1)); |
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|
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try { |
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new Phaser().bulkRegister(1 << 16); |
250 |
shouldThrow(); |
251 |
} catch (IllegalStateException success) {} |
252 |
|
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try { |
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new Phaser(2).bulkRegister((1 << 16) - 2); |
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shouldThrow(); |
256 |
} catch (IllegalStateException success) {} |
257 |
} |
258 |
|
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/** |
260 |
* the phase number increments correctly when tripping the barrier |
261 |
*/ |
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public void testPhaseIncrement1() { |
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for (int size = 1; size < nine; size++) { |
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final Phaser phaser = new Phaser(size); |
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for (int index = 0; index <= (1 << size); index++) { |
266 |
int phase = phaser.arrive(); |
267 |
assertTrue(index % size == 0 ? (index / size) == phase : index - (phase * size) > 0); |
268 |
} |
269 |
} |
270 |
} |
271 |
|
272 |
/** |
273 |
* arrive() on a registered phaser increments phase. |
274 |
*/ |
275 |
public void testArrive1() { |
276 |
Phaser phaser = new Phaser(1); |
277 |
assertState(phaser, 0, 1, 1); |
278 |
assertEquals(0, phaser.arrive()); |
279 |
assertState(phaser, 1, 1, 1); |
280 |
} |
281 |
|
282 |
/** |
283 |
* arriveAndDeregister does not wait for others to arrive at barrier |
284 |
*/ |
285 |
public void testArriveAndDeregister() { |
286 |
final Phaser phaser = new Phaser(1); |
287 |
for (int i = 0; i < 10; i++) { |
288 |
assertState(phaser, 0, 1, 1); |
289 |
assertEquals(0, phaser.register()); |
290 |
assertState(phaser, 0, 2, 2); |
291 |
assertEquals(0, phaser.arriveAndDeregister()); |
292 |
assertState(phaser, 0, 1, 1); |
293 |
} |
294 |
assertEquals(0, phaser.arriveAndDeregister()); |
295 |
assertTerminated(phaser, 1); |
296 |
} |
297 |
|
298 |
/** |
299 |
* arriveAndDeregister does not wait for others to arrive at barrier |
300 |
*/ |
301 |
public void testArrive2() { |
302 |
final Phaser phaser = new Phaser(); |
303 |
assertEquals(0, phaser.register()); |
304 |
List<Thread> threads = new ArrayList<Thread>(); |
305 |
for (int i = 0; i < 10; i++) { |
306 |
assertEquals(0, phaser.register()); |
307 |
threads.add(newStartedThread(new CheckedRunnable() { |
308 |
public void realRun() { |
309 |
assertEquals(0, phaser.arriveAndDeregister()); |
310 |
}})); |
311 |
} |
312 |
|
313 |
for (Thread thread : threads) |
314 |
awaitTermination(thread); |
315 |
assertState(phaser, 0, 1, 1); |
316 |
assertEquals(0, phaser.arrive()); |
317 |
assertState(phaser, 1, 1, 1); |
318 |
} |
319 |
|
320 |
/** |
321 |
* arrive() returns a negative number if the Phaser is terminated |
322 |
*/ |
323 |
public void testArrive3() { |
324 |
Phaser phaser = new Phaser(1); |
325 |
phaser.forceTermination(); |
326 |
assertTerminated(phaser, 0, 1); |
327 |
assertEquals(0, phaser.getPhase() + Integer.MIN_VALUE); |
328 |
assertTrue(phaser.arrive() < 0); |
329 |
assertTrue(phaser.register() < 0); |
330 |
assertTrue(phaser.arriveAndDeregister() < 0); |
331 |
assertTrue(phaser.awaitAdvance(1) < 0); |
332 |
assertTrue(phaser.getPhase() < 0); |
333 |
} |
334 |
|
335 |
/** |
336 |
* arriveAndDeregister() throws IllegalStateException if number of |
337 |
* registered or unarrived parties would become negative |
338 |
*/ |
339 |
public void testArriveAndDeregister1() { |
340 |
try { |
341 |
Phaser phaser = new Phaser(); |
342 |
phaser.arriveAndDeregister(); |
343 |
shouldThrow(); |
344 |
} catch (IllegalStateException success) {} |
345 |
} |
346 |
|
347 |
/** |
348 |
* arriveAndDeregister reduces the number of arrived parties |
349 |
*/ |
350 |
public void testArriveAndDeregister2() { |
351 |
final Phaser phaser = new Phaser(1); |
352 |
assertEquals(0, phaser.register()); |
353 |
assertEquals(0, phaser.arrive()); |
354 |
assertState(phaser, 0, 2, 1); |
355 |
assertEquals(0, phaser.arriveAndDeregister()); |
356 |
assertState(phaser, 1, 1, 1); |
357 |
} |
358 |
|
359 |
/** |
360 |
* arriveAndDeregister arrives at the barrier on a phaser with a parent and |
361 |
* when a deregistration occurs and causes the phaser to have zero parties |
362 |
* its parent will be deregistered as well |
363 |
*/ |
364 |
public void testArriveAndDeregister3() { |
365 |
Phaser parent = new Phaser(); |
366 |
Phaser child = new Phaser(parent); |
367 |
assertState(child, 0, 0, 0); |
368 |
assertState(parent, 0, 0, 0); |
369 |
assertEquals(0, child.register()); |
370 |
assertState(child, 0, 1, 1); |
371 |
assertState(parent, 0, 1, 1); |
372 |
assertEquals(0, child.arriveAndDeregister()); |
373 |
assertTerminated(child, 1); |
374 |
assertTerminated(parent, 1); |
375 |
} |
376 |
|
377 |
/** |
378 |
* arriveAndDeregister deregisters one party from its parent when |
379 |
* the number of parties of child is zero after deregistration |
380 |
*/ |
381 |
public void testArriveAndDeregister4() { |
382 |
Phaser parent = new Phaser(); |
383 |
Phaser child = new Phaser(parent); |
384 |
assertEquals(0, parent.register()); |
385 |
assertEquals(0, child.register()); |
386 |
assertState(child, 0, 1, 1); |
387 |
assertState(parent, 0, 2, 2); |
388 |
assertEquals(0, child.arriveAndDeregister()); |
389 |
assertState(child, 0, 0, 0); |
390 |
assertState(parent, 0, 1, 1); |
391 |
} |
392 |
|
393 |
/** |
394 |
* arriveAndDeregister deregisters one party from its parent when |
395 |
* the number of parties of root is nonzero after deregistration. |
396 |
*/ |
397 |
public void testArriveAndDeregister5() { |
398 |
Phaser root = new Phaser(); |
399 |
Phaser parent = new Phaser(root); |
400 |
Phaser child = new Phaser(parent); |
401 |
assertState(root, 0, 0, 0); |
402 |
assertState(parent, 0, 0, 0); |
403 |
assertState(child, 0, 0, 0); |
404 |
assertEquals(0, child.register()); |
405 |
assertState(root, 0, 1, 1); |
406 |
assertState(parent, 0, 1, 1); |
407 |
assertState(child, 0, 1, 1); |
408 |
assertEquals(0, child.arriveAndDeregister()); |
409 |
assertTerminated(child, 1); |
410 |
assertTerminated(parent, 1); |
411 |
assertTerminated(root, 1); |
412 |
} |
413 |
|
414 |
/** |
415 |
* arriveAndDeregister returns the phase in which it leaves the |
416 |
* phaser in after deregistration |
417 |
*/ |
418 |
public void testArriveAndDeregister6() { |
419 |
final Phaser phaser = new Phaser(2); |
420 |
Thread t = newStartedThread(new CheckedRunnable() { |
421 |
public void realRun() { |
422 |
assertEquals(0, phaser.arrive()); |
423 |
}}); |
424 |
assertEquals(1, phaser.arriveAndAwaitAdvance()); |
425 |
assertState(phaser, 1, 2, 2); |
426 |
assertEquals(1, phaser.arriveAndDeregister()); |
427 |
assertState(phaser, 1, 1, 1); |
428 |
assertEquals(1, phaser.arriveAndDeregister()); |
429 |
assertTerminated(phaser, 2); |
430 |
awaitTermination(t); |
431 |
} |
432 |
|
433 |
/** |
434 |
* awaitAdvance succeeds upon advance |
435 |
*/ |
436 |
public void testAwaitAdvance1() { |
437 |
final Phaser phaser = new Phaser(1); |
438 |
assertEquals(0, phaser.arrive()); |
439 |
assertEquals(1, phaser.awaitAdvance(0)); |
440 |
} |
441 |
|
442 |
/** |
443 |
* awaitAdvance with a negative parameter will return without affecting the |
444 |
* phaser |
445 |
*/ |
446 |
public void testAwaitAdvance2() { |
447 |
Phaser phaser = new Phaser(); |
448 |
assertTrue(phaser.awaitAdvance(-1) < 0); |
449 |
assertState(phaser, 0, 0, 0); |
450 |
} |
451 |
|
452 |
/** |
453 |
* awaitAdvanceInterruptibly blocks interruptibly |
454 |
*/ |
455 |
public void testAwaitAdvanceInterruptibly_interruptible() throws InterruptedException { |
456 |
final Phaser phaser = new Phaser(1); |
457 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(2); |
458 |
|
459 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
460 |
public void realRun() { |
461 |
Thread.currentThread().interrupt(); |
462 |
try { |
463 |
phaser.awaitAdvanceInterruptibly(0); |
464 |
shouldThrow(); |
465 |
} catch (InterruptedException success) {} |
466 |
assertFalse(Thread.interrupted()); |
467 |
|
468 |
pleaseInterrupt.countDown(); |
469 |
try { |
470 |
phaser.awaitAdvanceInterruptibly(0); |
471 |
shouldThrow(); |
472 |
} catch (InterruptedException success) {} |
473 |
assertFalse(Thread.interrupted()); |
474 |
}}); |
475 |
|
476 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
477 |
public void realRun() throws TimeoutException { |
478 |
Thread.currentThread().interrupt(); |
479 |
try { |
480 |
phaser.awaitAdvanceInterruptibly(0, 2*LONG_DELAY_MS, MILLISECONDS); |
481 |
shouldThrow(); |
482 |
} catch (InterruptedException success) {} |
483 |
assertFalse(Thread.interrupted()); |
484 |
|
485 |
pleaseInterrupt.countDown(); |
486 |
try { |
487 |
phaser.awaitAdvanceInterruptibly(0, 2*LONG_DELAY_MS, MILLISECONDS); |
488 |
shouldThrow(); |
489 |
} catch (InterruptedException success) {} |
490 |
assertFalse(Thread.interrupted()); |
491 |
}}); |
492 |
|
493 |
await(pleaseInterrupt); |
494 |
assertState(phaser, 0, 1, 1); |
495 |
assertThreadsStayAlive(t1, t2); |
496 |
t1.interrupt(); |
497 |
t2.interrupt(); |
498 |
awaitTermination(t1); |
499 |
awaitTermination(t2); |
500 |
assertState(phaser, 0, 1, 1); |
501 |
assertEquals(0, phaser.arrive()); |
502 |
assertState(phaser, 1, 1, 1); |
503 |
} |
504 |
|
505 |
/** |
506 |
* awaitAdvance continues waiting if interrupted before waiting |
507 |
*/ |
508 |
public void testAwaitAdvanceAfterInterrupt() { |
509 |
final Phaser phaser = new Phaser(); |
510 |
assertEquals(0, phaser.register()); |
511 |
final CountDownLatch pleaseArrive = new CountDownLatch(1); |
512 |
|
513 |
Thread t = newStartedThread(new CheckedRunnable() { |
514 |
public void realRun() { |
515 |
Thread.currentThread().interrupt(); |
516 |
assertEquals(0, phaser.register()); |
517 |
assertEquals(0, phaser.arrive()); |
518 |
pleaseArrive.countDown(); |
519 |
assertTrue(Thread.currentThread().isInterrupted()); |
520 |
assertEquals(1, phaser.awaitAdvance(0)); |
521 |
assertTrue(Thread.interrupted()); |
522 |
}}); |
523 |
|
524 |
await(pleaseArrive); |
525 |
waitForThreadToEnterWaitState(t, SHORT_DELAY_MS); |
526 |
assertEquals(0, phaser.arrive()); |
527 |
awaitTermination(t); |
528 |
|
529 |
Thread.currentThread().interrupt(); |
530 |
assertEquals(1, phaser.awaitAdvance(0)); |
531 |
assertTrue(Thread.interrupted()); |
532 |
} |
533 |
|
534 |
/** |
535 |
* awaitAdvance continues waiting if interrupted while waiting |
536 |
*/ |
537 |
public void testAwaitAdvanceBeforeInterrupt() { |
538 |
final Phaser phaser = new Phaser(); |
539 |
assertEquals(0, phaser.register()); |
540 |
final CountDownLatch pleaseArrive = new CountDownLatch(1); |
541 |
|
542 |
Thread t = newStartedThread(new CheckedRunnable() { |
543 |
public void realRun() { |
544 |
assertEquals(0, phaser.register()); |
545 |
assertEquals(0, phaser.arrive()); |
546 |
assertFalse(Thread.currentThread().isInterrupted()); |
547 |
pleaseArrive.countDown(); |
548 |
assertEquals(1, phaser.awaitAdvance(0)); |
549 |
assertTrue(Thread.interrupted()); |
550 |
}}); |
551 |
|
552 |
await(pleaseArrive); |
553 |
waitForThreadToEnterWaitState(t, SHORT_DELAY_MS); |
554 |
t.interrupt(); |
555 |
assertEquals(0, phaser.arrive()); |
556 |
awaitTermination(t); |
557 |
|
558 |
Thread.currentThread().interrupt(); |
559 |
assertEquals(1, phaser.awaitAdvance(0)); |
560 |
assertTrue(Thread.interrupted()); |
561 |
} |
562 |
|
563 |
/** |
564 |
* arriveAndAwaitAdvance continues waiting if interrupted before waiting |
565 |
*/ |
566 |
public void testArriveAndAwaitAdvanceAfterInterrupt() { |
567 |
final Phaser phaser = new Phaser(); |
568 |
assertEquals(0, phaser.register()); |
569 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
570 |
|
571 |
Thread t = newStartedThread(new CheckedRunnable() { |
572 |
public void realRun() { |
573 |
Thread.currentThread().interrupt(); |
574 |
assertEquals(0, phaser.register()); |
575 |
pleaseInterrupt.countDown(); |
576 |
assertTrue(Thread.currentThread().isInterrupted()); |
577 |
assertEquals(1, phaser.arriveAndAwaitAdvance()); |
578 |
assertTrue(Thread.currentThread().isInterrupted()); |
579 |
}}); |
580 |
|
581 |
await(pleaseInterrupt); |
582 |
waitForThreadToEnterWaitState(t, SHORT_DELAY_MS); |
583 |
Thread.currentThread().interrupt(); |
584 |
assertEquals(1, phaser.arriveAndAwaitAdvance()); |
585 |
assertTrue(Thread.interrupted()); |
586 |
awaitTermination(t); |
587 |
} |
588 |
|
589 |
/** |
590 |
* arriveAndAwaitAdvance continues waiting if interrupted while waiting |
591 |
*/ |
592 |
public void testArriveAndAwaitAdvanceBeforeInterrupt() { |
593 |
final Phaser phaser = new Phaser(); |
594 |
assertEquals(0, phaser.register()); |
595 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
596 |
|
597 |
Thread t = newStartedThread(new CheckedRunnable() { |
598 |
public void realRun() { |
599 |
assertEquals(0, phaser.register()); |
600 |
assertFalse(Thread.currentThread().isInterrupted()); |
601 |
pleaseInterrupt.countDown(); |
602 |
assertEquals(1, phaser.arriveAndAwaitAdvance()); |
603 |
assertTrue(Thread.currentThread().isInterrupted()); |
604 |
}}); |
605 |
|
606 |
await(pleaseInterrupt); |
607 |
waitForThreadToEnterWaitState(t, SHORT_DELAY_MS); |
608 |
t.interrupt(); |
609 |
Thread.currentThread().interrupt(); |
610 |
assertEquals(1, phaser.arriveAndAwaitAdvance()); |
611 |
assertTrue(Thread.interrupted()); |
612 |
awaitTermination(t); |
613 |
} |
614 |
|
615 |
/** |
616 |
* awaitAdvance atomically waits for all parties within the same phase to |
617 |
* complete before continuing |
618 |
*/ |
619 |
public void testAwaitAdvance4() { |
620 |
final Phaser phaser = new Phaser(4); |
621 |
final AtomicInteger count = new AtomicInteger(0); |
622 |
List<Thread> threads = new ArrayList<Thread>(); |
623 |
for (int i = 0; i < 4; i++) |
624 |
threads.add(newStartedThread(new CheckedRunnable() { |
625 |
public void realRun() { |
626 |
for (int k = 0; k < 3; k++) { |
627 |
assertEquals(2*k+1, phaser.arriveAndAwaitAdvance()); |
628 |
count.incrementAndGet(); |
629 |
assertEquals(2*k+1, phaser.arrive()); |
630 |
assertEquals(2*k+2, phaser.awaitAdvance(2*k+1)); |
631 |
assertEquals(4*(k+1), count.get()); |
632 |
}}})); |
633 |
|
634 |
for (Thread thread : threads) |
635 |
awaitTermination(thread); |
636 |
} |
637 |
|
638 |
/** |
639 |
* awaitAdvance returns the current phase |
640 |
*/ |
641 |
public void testAwaitAdvance5() { |
642 |
final Phaser phaser = new Phaser(1); |
643 |
assertEquals(1, phaser.awaitAdvance(phaser.arrive())); |
644 |
assertEquals(1, phaser.getPhase()); |
645 |
assertEquals(1, phaser.register()); |
646 |
List<Thread> threads = new ArrayList<Thread>(); |
647 |
for (int i = 0; i < 8; i++) { |
648 |
final CountDownLatch latch = new CountDownLatch(1); |
649 |
final boolean goesFirst = ((i & 1) == 0); |
650 |
threads.add(newStartedThread(new CheckedRunnable() { |
651 |
public void realRun() { |
652 |
if (goesFirst) |
653 |
latch.countDown(); |
654 |
else |
655 |
await(latch); |
656 |
phaser.arrive(); |
657 |
}})); |
658 |
if (goesFirst) |
659 |
await(latch); |
660 |
else |
661 |
latch.countDown(); |
662 |
assertEquals(i + 2, phaser.awaitAdvance(phaser.arrive())); |
663 |
assertEquals(i + 2, phaser.getPhase()); |
664 |
} |
665 |
for (Thread thread : threads) |
666 |
awaitTermination(thread); |
667 |
} |
668 |
|
669 |
/** |
670 |
* awaitAdvance returns the current phase in child phasers |
671 |
*/ |
672 |
public void testAwaitAdvanceTieredPhaser() throws Exception { |
673 |
final Phaser parent = new Phaser(); |
674 |
final List<Phaser> zeroPartyChildren = new ArrayList<Phaser>(3); |
675 |
final List<Phaser> onePartyChildren = new ArrayList<Phaser>(3); |
676 |
for (int i = 0; i < 3; i++) { |
677 |
zeroPartyChildren.add(new Phaser(parent, 0)); |
678 |
onePartyChildren.add(new Phaser(parent, 1)); |
679 |
} |
680 |
final List<Phaser> phasers = new ArrayList<Phaser>(); |
681 |
phasers.addAll(zeroPartyChildren); |
682 |
phasers.addAll(onePartyChildren); |
683 |
phasers.add(parent); |
684 |
for (Phaser phaser : phasers) { |
685 |
assertEquals(-42, phaser.awaitAdvance(-42)); |
686 |
assertEquals(-42, phaser.awaitAdvanceInterruptibly(-42)); |
687 |
assertEquals(-42, phaser.awaitAdvanceInterruptibly(-42, SMALL_DELAY_MS, MILLISECONDS)); |
688 |
} |
689 |
|
690 |
for (Phaser child : onePartyChildren) |
691 |
assertEquals(0, child.arrive()); |
692 |
for (Phaser phaser : phasers) { |
693 |
assertEquals(-42, phaser.awaitAdvance(-42)); |
694 |
assertEquals(-42, phaser.awaitAdvanceInterruptibly(-42)); |
695 |
assertEquals(-42, phaser.awaitAdvanceInterruptibly(-42, SMALL_DELAY_MS, MILLISECONDS)); |
696 |
assertEquals(1, phaser.awaitAdvance(0)); |
697 |
assertEquals(1, phaser.awaitAdvanceInterruptibly(0)); |
698 |
assertEquals(1, phaser.awaitAdvanceInterruptibly(0, SMALL_DELAY_MS, MILLISECONDS)); |
699 |
} |
700 |
|
701 |
for (Phaser child : onePartyChildren) |
702 |
assertEquals(1, child.arrive()); |
703 |
for (Phaser phaser : phasers) { |
704 |
assertEquals(-42, phaser.awaitAdvance(-42)); |
705 |
assertEquals(-42, phaser.awaitAdvanceInterruptibly(-42)); |
706 |
assertEquals(-42, phaser.awaitAdvanceInterruptibly(-42, SMALL_DELAY_MS, MILLISECONDS)); |
707 |
assertEquals(2, phaser.awaitAdvance(0)); |
708 |
assertEquals(2, phaser.awaitAdvanceInterruptibly(0)); |
709 |
assertEquals(2, phaser.awaitAdvanceInterruptibly(0, SMALL_DELAY_MS, MILLISECONDS)); |
710 |
assertEquals(2, phaser.awaitAdvance(1)); |
711 |
assertEquals(2, phaser.awaitAdvanceInterruptibly(1)); |
712 |
assertEquals(2, phaser.awaitAdvanceInterruptibly(1, SMALL_DELAY_MS, MILLISECONDS)); |
713 |
} |
714 |
} |
715 |
|
716 |
/** |
717 |
* awaitAdvance returns when the phaser is externally terminated |
718 |
*/ |
719 |
public void testAwaitAdvance6() { |
720 |
final Phaser phaser = new Phaser(3); |
721 |
final CountDownLatch pleaseForceTermination = new CountDownLatch(2); |
722 |
final List<Thread> threads = new ArrayList<Thread>(); |
723 |
for (int i = 0; i < 2; i++) { |
724 |
Runnable r = new CheckedRunnable() { |
725 |
public void realRun() { |
726 |
assertEquals(0, phaser.arrive()); |
727 |
pleaseForceTermination.countDown(); |
728 |
assertTrue(phaser.awaitAdvance(0) < 0); |
729 |
assertTrue(phaser.isTerminated()); |
730 |
assertTrue(phaser.getPhase() < 0); |
731 |
assertEquals(0, phaser.getPhase() + Integer.MIN_VALUE); |
732 |
assertEquals(3, phaser.getRegisteredParties()); |
733 |
}}; |
734 |
threads.add(newStartedThread(r)); |
735 |
} |
736 |
await(pleaseForceTermination); |
737 |
phaser.forceTermination(); |
738 |
assertTrue(phaser.isTerminated()); |
739 |
assertEquals(0, phaser.getPhase() + Integer.MIN_VALUE); |
740 |
for (Thread thread : threads) |
741 |
awaitTermination(thread); |
742 |
assertEquals(3, phaser.getRegisteredParties()); |
743 |
} |
744 |
|
745 |
/** |
746 |
* arriveAndAwaitAdvance throws IllegalStateException with no |
747 |
* unarrived parties |
748 |
*/ |
749 |
public void testArriveAndAwaitAdvance1() { |
750 |
try { |
751 |
Phaser phaser = new Phaser(); |
752 |
phaser.arriveAndAwaitAdvance(); |
753 |
shouldThrow(); |
754 |
} catch (IllegalStateException success) {} |
755 |
} |
756 |
|
757 |
/** |
758 |
* arriveAndAwaitAdvance waits for all threads to arrive, the |
759 |
* number of arrived parties is the same number that is accounted |
760 |
* for when the main thread awaitsAdvance |
761 |
*/ |
762 |
public void testArriveAndAwaitAdvance3() { |
763 |
final Phaser phaser = new Phaser(1); |
764 |
final int THREADS = 3; |
765 |
final CountDownLatch pleaseArrive = new CountDownLatch(THREADS); |
766 |
final List<Thread> threads = new ArrayList<Thread>(); |
767 |
for (int i = 0; i < THREADS; i++) |
768 |
threads.add(newStartedThread(new CheckedRunnable() { |
769 |
public void realRun() { |
770 |
assertEquals(0, phaser.register()); |
771 |
pleaseArrive.countDown(); |
772 |
assertEquals(1, phaser.arriveAndAwaitAdvance()); |
773 |
}})); |
774 |
|
775 |
await(pleaseArrive); |
776 |
long startTime = System.nanoTime(); |
777 |
while (phaser.getArrivedParties() < THREADS) |
778 |
Thread.yield(); |
779 |
assertEquals(THREADS, phaser.getArrivedParties()); |
780 |
assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS); |
781 |
for (Thread thread : threads) |
782 |
waitForThreadToEnterWaitState(thread, SHORT_DELAY_MS); |
783 |
for (Thread thread : threads) |
784 |
assertTrue(thread.isAlive()); |
785 |
assertState(phaser, 0, THREADS + 1, 1); |
786 |
phaser.arriveAndAwaitAdvance(); |
787 |
for (Thread thread : threads) |
788 |
awaitTermination(thread); |
789 |
assertState(phaser, 1, THREADS + 1, THREADS + 1); |
790 |
} |
791 |
|
792 |
} |