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/licenses/publicdomain |
5 |
* Other contributors include John Vint |
6 |
*/ |
7 |
|
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import java.util.ArrayList; |
9 |
import java.util.List; |
10 |
import java.util.concurrent.atomic.AtomicInteger; |
11 |
import java.util.concurrent.atomic.AtomicBoolean; |
12 |
import java.util.concurrent.*; |
13 |
import static java.util.concurrent.TimeUnit.MILLISECONDS; |
14 |
import static java.util.concurrent.TimeUnit.NANOSECONDS; |
15 |
import junit.framework.Test; |
16 |
import junit.framework.TestSuite; |
17 |
|
18 |
public class PhaserTest extends JSR166TestCase { |
19 |
|
20 |
public static void main(String[] args) { |
21 |
junit.textui.TestRunner.run(suite()); |
22 |
} |
23 |
|
24 |
public static Test suite() { |
25 |
return new TestSuite(PhaserTest.class); |
26 |
} |
27 |
|
28 |
private static final int maxParties = 65535; |
29 |
|
30 |
/** Checks state of phaser. */ |
31 |
protected void assertState(Phaser phaser, |
32 |
int phase, int parties, int unarrived) { |
33 |
assertEquals(phase, phaser.getPhase()); |
34 |
assertEquals(parties, phaser.getRegisteredParties()); |
35 |
assertEquals(unarrived, phaser.getUnarrivedParties()); |
36 |
assertEquals(parties - unarrived, phaser.getArrivedParties()); |
37 |
assertTrue((phaser.getPhase() >= 0) ^ phaser.isTerminated()); |
38 |
} |
39 |
|
40 |
/** Checks state of terminated phaser. */ |
41 |
protected void assertTerminated(Phaser phaser, |
42 |
int maxPhase, int parties, int unarrived) { |
43 |
assertTrue(phaser.isTerminated()); |
44 |
int expectedPhase = maxPhase + Integer.MIN_VALUE; |
45 |
assertState(phaser, expectedPhase, parties, unarrived); |
46 |
assertEquals(expectedPhase, phaser.register()); |
47 |
assertEquals(expectedPhase, phaser.arrive()); |
48 |
assertEquals(expectedPhase, phaser.arriveAndDeregister()); |
49 |
} |
50 |
|
51 |
protected void assertTerminated(Phaser phaser, int maxPhase) { |
52 |
assertTerminated(phaser, maxPhase, 0, 0); |
53 |
} |
54 |
|
55 |
/** |
56 |
* Empty constructor builds a new Phaser with no parent, no registered |
57 |
* parties and initial phase number of 0 |
58 |
*/ |
59 |
public void testConstructorDefaultValues() { |
60 |
Phaser phaser = new Phaser(); |
61 |
assertNull(phaser.getParent()); |
62 |
assertEquals(0, phaser.getRegisteredParties()); |
63 |
assertEquals(0, phaser.getArrivedParties()); |
64 |
assertEquals(0, phaser.getUnarrivedParties()); |
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assertEquals(0, phaser.getPhase()); |
66 |
} |
67 |
|
68 |
/** |
69 |
* Constructing with a negative number of parties throws |
70 |
* IllegalArgumentException |
71 |
*/ |
72 |
public void testConstructorNegativeParties() { |
73 |
try { |
74 |
new Phaser(-1); |
75 |
shouldThrow(); |
76 |
} catch (IllegalArgumentException success) {} |
77 |
} |
78 |
|
79 |
/** |
80 |
* Constructing with a negative number of parties throws |
81 |
* IllegalArgumentException |
82 |
*/ |
83 |
public void testConstructorNegativeParties2() { |
84 |
try { |
85 |
new Phaser(new Phaser(), -1); |
86 |
shouldThrow(); |
87 |
} catch (IllegalArgumentException success) {} |
88 |
} |
89 |
|
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/** |
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* Constructing with a number of parties > 65535 throws |
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* IllegalArgumentException |
93 |
*/ |
94 |
public void testConstructorPartiesExceedsLimit() { |
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new Phaser(maxParties); |
96 |
try { |
97 |
new Phaser(maxParties + 1); |
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shouldThrow(); |
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} catch (IllegalArgumentException success) {} |
100 |
|
101 |
new Phaser(new Phaser(), maxParties); |
102 |
try { |
103 |
new Phaser(new Phaser(), maxParties + 1); |
104 |
shouldThrow(); |
105 |
} catch (IllegalArgumentException success) {} |
106 |
} |
107 |
|
108 |
/** |
109 |
* The parent provided to the constructor should be returned from |
110 |
* a later call to getParent |
111 |
*/ |
112 |
public void testConstructor3() { |
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Phaser parent = new Phaser(); |
114 |
assertSame(parent, new Phaser(parent).getParent()); |
115 |
assertNull(new Phaser(null).getParent()); |
116 |
} |
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|
118 |
/** |
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* The parent being input into the parameter should equal the original |
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* parent when being returned |
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*/ |
122 |
public void testConstructor5() { |
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Phaser parent = new Phaser(); |
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assertSame(parent, new Phaser(parent, 0).getParent()); |
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assertNull(new Phaser(null, 0).getParent()); |
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} |
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|
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/** |
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* register() will increment the number of unarrived parties by |
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* one and not affect its arrived parties |
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*/ |
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public void testRegister1() { |
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Phaser phaser = new Phaser(); |
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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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} |
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|
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/** |
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* Registering more than 65536 parties causes IllegalStateException |
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*/ |
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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(); |
160 |
} catch (IllegalStateException success) {} |
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} |
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|
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/** |
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* register() correctly returns the current barrier phase number when |
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* invoked |
166 |
*/ |
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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 rather retain |
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* 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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* 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 { |
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new Phaser().bulkRegister(-1); |
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shouldThrow(); |
195 |
} catch (IllegalArgumentException success) {} |
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} |
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|
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/** |
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* bulkRegister should correctly record the number of unarrived parties with |
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* 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(20)); |
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assertState(phaser, 0, 20, 20); |
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} |
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|
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/** |
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* Registering with a number of parties greater than or equal to 1<<16 |
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* throws IllegalStateException. |
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*/ |
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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); |
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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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new Phaser(2).bulkRegister((1 << 16) - 2); |
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shouldThrow(); |
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} catch (IllegalStateException success) {} |
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} |
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|
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/** |
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* the phase number increments correctly when tripping the barrier |
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*/ |
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public void testPhaseIncrement1() { |
230 |
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++) { |
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int phase = phaser.arrive(); |
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assertTrue(index % size == 0 ? (index / size) == phase : index - (phase * size) > 0); |
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} |
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} |
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} |
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|
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/** |
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* arrive() on a registered phaser increments phase. |
241 |
*/ |
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public void testArrive1() { |
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Phaser phaser = new Phaser(1); |
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assertState(phaser, 0, 1, 1); |
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assertEquals(0, phaser.arrive()); |
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assertState(phaser, 1, 1, 1); |
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} |
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|
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/** |
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* arriveAndDeregister does not wait for others to arrive at barrier |
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*/ |
252 |
public void testArriveAndDeregister() throws InterruptedException { |
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final Phaser phaser = new Phaser(1); |
254 |
for (int i = 0; i < 10; i++) { |
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assertState(phaser, 0, 1, 1); |
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assertEquals(0, phaser.register()); |
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assertState(phaser, 0, 2, 2); |
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assertEquals(0, phaser.arriveAndDeregister()); |
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assertState(phaser, 0, 1, 1); |
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} |
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assertEquals(0, phaser.arriveAndDeregister()); |
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assertTerminated(phaser, 1); |
263 |
} |
264 |
|
265 |
/** |
266 |
* arriveAndDeregister does not wait for others to arrive at barrier |
267 |
*/ |
268 |
public void testArrive2() throws InterruptedException { |
269 |
final Phaser phaser = new Phaser(); |
270 |
assertEquals(0, phaser.register()); |
271 |
List<Thread> threads = new ArrayList<Thread>(); |
272 |
for (int i = 0; i < 10; i++) { |
273 |
assertEquals(0, phaser.register()); |
274 |
threads.add(newStartedThread(new CheckedRunnable() { |
275 |
public void realRun() throws InterruptedException { |
276 |
assertEquals(0, phaser.arriveAndDeregister()); |
277 |
}})); |
278 |
} |
279 |
|
280 |
for (Thread thread : threads) |
281 |
awaitTermination(thread, LONG_DELAY_MS); |
282 |
assertState(phaser, 0, 1, 1); |
283 |
assertEquals(0, phaser.arrive()); |
284 |
assertState(phaser, 1, 1, 1); |
285 |
} |
286 |
|
287 |
/** |
288 |
* arrive() returns a negative number if the Phaser is terminated |
289 |
*/ |
290 |
public void testArrive3() { |
291 |
Phaser phaser = new Phaser(1); |
292 |
phaser.forceTermination(); |
293 |
assertTerminated(phaser, 0, 1, 1); |
294 |
assertEquals(0, phaser.getPhase() + Integer.MIN_VALUE); |
295 |
assertTrue(phaser.arrive() < 0); |
296 |
assertTrue(phaser.register() < 0); |
297 |
assertTrue(phaser.arriveAndDeregister() < 0); |
298 |
assertTrue(phaser.awaitAdvance(1) < 0); |
299 |
assertTrue(phaser.getPhase() < 0); |
300 |
} |
301 |
|
302 |
/** |
303 |
* arriveAndDeregister() throws IllegalStateException if number of |
304 |
* registered or unarrived parties would become negative |
305 |
*/ |
306 |
public void testArriveAndDeregister1() { |
307 |
try { |
308 |
Phaser phaser = new Phaser(); |
309 |
phaser.arriveAndDeregister(); |
310 |
shouldThrow(); |
311 |
} catch (IllegalStateException success) {} |
312 |
} |
313 |
|
314 |
/** |
315 |
* arriveAndDeregister reduces the number of arrived parties |
316 |
*/ |
317 |
public void testArriveAndDeregister2() { |
318 |
final Phaser phaser = new Phaser(1); |
319 |
assertEquals(0, phaser.register()); |
320 |
assertEquals(0, phaser.arrive()); |
321 |
assertState(phaser, 0, 2, 1); |
322 |
assertEquals(0, phaser.arriveAndDeregister()); |
323 |
assertState(phaser, 1, 1, 1); |
324 |
} |
325 |
|
326 |
/** |
327 |
* arriveAndDeregister arrives at the barrier on a phaser with a parent and |
328 |
* when a deregistration occurs and causes the phaser to have zero parties |
329 |
* its parent will be deregistered as well |
330 |
*/ |
331 |
public void testArriveAndDeregister3() { |
332 |
Phaser parent = new Phaser(); |
333 |
Phaser child = new Phaser(parent); |
334 |
assertState(child, 0, 0, 0); |
335 |
assertState(parent, 0, 0, 0); |
336 |
assertEquals(0, child.register()); |
337 |
assertState(child, 0, 1, 1); |
338 |
assertState(parent, 0, 1, 1); |
339 |
assertEquals(0, child.arriveAndDeregister()); |
340 |
assertTerminated(child, 1); |
341 |
assertTerminated(parent, 1); |
342 |
} |
343 |
|
344 |
/** |
345 |
* arriveAndDeregister deregisters one party from its parent when |
346 |
* the number of parties of child is zero after deregistration |
347 |
*/ |
348 |
public void testArriveAndDeregister4() { |
349 |
Phaser parent = new Phaser(); |
350 |
Phaser child = new Phaser(parent); |
351 |
assertEquals(0, parent.register()); |
352 |
assertEquals(0, child.register()); |
353 |
assertState(child, 0, 1, 1); |
354 |
assertState(parent, 0, 2, 2); |
355 |
assertEquals(0, child.arriveAndDeregister()); |
356 |
assertState(child, 0, 0, 0); |
357 |
assertState(parent, 0, 1, 1); |
358 |
} |
359 |
|
360 |
/** |
361 |
* arriveAndDeregister deregisters one party from its parent when |
362 |
* the number of parties of root is nonzero after deregistration. |
363 |
*/ |
364 |
public void testArriveAndDeregister5() { |
365 |
Phaser root = new Phaser(); |
366 |
Phaser parent = new Phaser(root); |
367 |
Phaser child = new Phaser(parent); |
368 |
assertState(root, 0, 0, 0); |
369 |
assertState(parent, 0, 0, 0); |
370 |
assertState(child, 0, 0, 0); |
371 |
assertEquals(0, child.register()); |
372 |
assertState(root, 0, 1, 1); |
373 |
assertState(parent, 0, 1, 1); |
374 |
assertState(child, 0, 1, 1); |
375 |
assertEquals(0, child.arriveAndDeregister()); |
376 |
assertTerminated(child, 1); |
377 |
assertTerminated(parent, 1); |
378 |
assertTerminated(root, 1); |
379 |
} |
380 |
|
381 |
/** |
382 |
* arriveAndDeregister returns the phase in which it leaves the |
383 |
* phaser in after deregistration |
384 |
*/ |
385 |
public void testArriveAndDeregister6() throws InterruptedException { |
386 |
final Phaser phaser = new Phaser(2); |
387 |
Thread t = newStartedThread(new CheckedRunnable() { |
388 |
public void realRun() { |
389 |
assertEquals(0, phaser.arrive()); |
390 |
}}); |
391 |
assertEquals(1, phaser.arriveAndAwaitAdvance()); |
392 |
assertState(phaser, 1, 2, 2); |
393 |
assertEquals(1, phaser.arriveAndDeregister()); |
394 |
assertState(phaser, 1, 1, 1); |
395 |
assertEquals(1, phaser.arriveAndDeregister()); |
396 |
assertTerminated(phaser, 2); |
397 |
awaitTermination(t, SHORT_DELAY_MS); |
398 |
} |
399 |
|
400 |
/** |
401 |
* awaitAdvance succeeds upon advance |
402 |
*/ |
403 |
public void testAwaitAdvance1() { |
404 |
final Phaser phaser = new Phaser(1); |
405 |
assertEquals(0, phaser.arrive()); |
406 |
assertEquals(1, phaser.awaitAdvance(0)); |
407 |
} |
408 |
|
409 |
/** |
410 |
* awaitAdvance with a negative parameter will return without affecting the |
411 |
* phaser |
412 |
*/ |
413 |
public void testAwaitAdvance2() { |
414 |
Phaser phaser = new Phaser(); |
415 |
assertTrue(phaser.awaitAdvance(-1) < 0); |
416 |
assertState(phaser, 0, 0, 0); |
417 |
} |
418 |
|
419 |
/** |
420 |
* awaitAdvance continues waiting if interrupted before waiting |
421 |
*/ |
422 |
public void testAwaitAdvanceAfterInterrupt() throws InterruptedException { |
423 |
final Phaser phaser = new Phaser(); |
424 |
assertEquals(0, phaser.register()); |
425 |
final CountDownLatch threadStarted = new CountDownLatch(1); |
426 |
|
427 |
Thread t = newStartedThread(new CheckedRunnable() { |
428 |
public void realRun() throws InterruptedException { |
429 |
Thread.currentThread().interrupt(); |
430 |
assertEquals(0, phaser.register()); |
431 |
assertEquals(0, phaser.arrive()); |
432 |
threadStarted.countDown(); |
433 |
assertTrue(Thread.currentThread().isInterrupted()); |
434 |
assertEquals(1, phaser.awaitAdvance(0)); |
435 |
assertTrue(Thread.currentThread().isInterrupted()); |
436 |
}}); |
437 |
|
438 |
assertTrue(threadStarted.await(SMALL_DELAY_MS, MILLISECONDS)); |
439 |
waitForThreadToEnterWaitState(t, SMALL_DELAY_MS); |
440 |
assertEquals(0, phaser.arrive()); |
441 |
awaitTermination(t, SMALL_DELAY_MS); |
442 |
|
443 |
Thread.currentThread().interrupt(); |
444 |
assertEquals(1, phaser.awaitAdvance(0)); |
445 |
assertTrue(Thread.interrupted()); |
446 |
} |
447 |
|
448 |
/** |
449 |
* awaitAdvance continues waiting if interrupted while waiting |
450 |
*/ |
451 |
public void testAwaitAdvanceBeforeInterrupt() throws InterruptedException { |
452 |
final Phaser phaser = new Phaser(); |
453 |
assertEquals(0, phaser.register()); |
454 |
final CountDownLatch threadStarted = new CountDownLatch(1); |
455 |
|
456 |
Thread t = newStartedThread(new CheckedRunnable() { |
457 |
public void realRun() throws InterruptedException { |
458 |
assertEquals(0, phaser.register()); |
459 |
assertEquals(0, phaser.arrive()); |
460 |
threadStarted.countDown(); |
461 |
assertFalse(Thread.currentThread().isInterrupted()); |
462 |
assertEquals(1, phaser.awaitAdvance(0)); |
463 |
assertTrue(Thread.currentThread().isInterrupted()); |
464 |
}}); |
465 |
|
466 |
assertTrue(threadStarted.await(SMALL_DELAY_MS, MILLISECONDS)); |
467 |
waitForThreadToEnterWaitState(t, SMALL_DELAY_MS); |
468 |
t.interrupt(); |
469 |
assertEquals(0, phaser.arrive()); |
470 |
awaitTermination(t, SMALL_DELAY_MS); |
471 |
|
472 |
Thread.currentThread().interrupt(); |
473 |
assertEquals(1, phaser.awaitAdvance(0)); |
474 |
assertTrue(Thread.interrupted()); |
475 |
} |
476 |
|
477 |
/** |
478 |
* arriveAndAwaitAdvance continues waiting if interrupted before waiting |
479 |
*/ |
480 |
public void testArriveAndAwaitAdvanceAfterInterrupt() |
481 |
throws InterruptedException { |
482 |
final Phaser phaser = new Phaser(); |
483 |
assertEquals(0, phaser.register()); |
484 |
final CountDownLatch threadStarted = new CountDownLatch(1); |
485 |
|
486 |
Thread t = newStartedThread(new CheckedRunnable() { |
487 |
public void realRun() throws InterruptedException { |
488 |
Thread.currentThread().interrupt(); |
489 |
assertEquals(0, phaser.register()); |
490 |
threadStarted.countDown(); |
491 |
assertTrue(Thread.currentThread().isInterrupted()); |
492 |
assertEquals(1, phaser.arriveAndAwaitAdvance()); |
493 |
assertTrue(Thread.currentThread().isInterrupted()); |
494 |
}}); |
495 |
|
496 |
assertTrue(threadStarted.await(SMALL_DELAY_MS, MILLISECONDS)); |
497 |
waitForThreadToEnterWaitState(t, SMALL_DELAY_MS); |
498 |
Thread.currentThread().interrupt(); |
499 |
assertEquals(1, phaser.arriveAndAwaitAdvance()); |
500 |
assertTrue(Thread.interrupted()); |
501 |
awaitTermination(t, SMALL_DELAY_MS); |
502 |
} |
503 |
|
504 |
/** |
505 |
* arriveAndAwaitAdvance continues waiting if interrupted while waiting |
506 |
*/ |
507 |
public void testArriveAndAwaitAdvanceBeforeInterrupt() |
508 |
throws InterruptedException { |
509 |
final Phaser phaser = new Phaser(); |
510 |
assertEquals(0, phaser.register()); |
511 |
final CountDownLatch threadStarted = new CountDownLatch(1); |
512 |
|
513 |
Thread t = newStartedThread(new CheckedRunnable() { |
514 |
public void realRun() throws InterruptedException { |
515 |
assertEquals(0, phaser.register()); |
516 |
threadStarted.countDown(); |
517 |
assertFalse(Thread.currentThread().isInterrupted()); |
518 |
assertEquals(1, phaser.arriveAndAwaitAdvance()); |
519 |
assertTrue(Thread.currentThread().isInterrupted()); |
520 |
}}); |
521 |
|
522 |
assertTrue(threadStarted.await(SMALL_DELAY_MS, MILLISECONDS)); |
523 |
waitForThreadToEnterWaitState(t, SMALL_DELAY_MS); |
524 |
t.interrupt(); |
525 |
Thread.currentThread().interrupt(); |
526 |
assertEquals(1, phaser.arriveAndAwaitAdvance()); |
527 |
assertTrue(Thread.interrupted()); |
528 |
awaitTermination(t, SMALL_DELAY_MS); |
529 |
} |
530 |
|
531 |
/** |
532 |
* awaitAdvance atomically waits for all parties within the same phase to |
533 |
* complete before continuing |
534 |
*/ |
535 |
public void testAwaitAdvance4() throws InterruptedException { |
536 |
final Phaser phaser = new Phaser(4); |
537 |
final AtomicInteger count = new AtomicInteger(0); |
538 |
List<Thread> threads = new ArrayList<Thread>(); |
539 |
for (int i = 0; i < 4; i++) |
540 |
threads.add(newStartedThread(new CheckedRunnable() { |
541 |
public void realRun() { |
542 |
for (int k = 0; k < 3; k++) { |
543 |
assertEquals(2*k+1, phaser.arriveAndAwaitAdvance()); |
544 |
count.incrementAndGet(); |
545 |
assertEquals(2*k+1, phaser.arrive()); |
546 |
assertEquals(2*k+2, phaser.awaitAdvance(2*k+1)); |
547 |
assertEquals(count.get(), 4*(k+1)); |
548 |
}}})); |
549 |
|
550 |
for (Thread thread : threads) |
551 |
awaitTermination(thread, MEDIUM_DELAY_MS); |
552 |
} |
553 |
|
554 |
/** |
555 |
* awaitAdvance returns the current phase |
556 |
*/ |
557 |
public void testAwaitAdvance5() throws InterruptedException { |
558 |
final Phaser phaser = new Phaser(1); |
559 |
assertEquals(1, phaser.awaitAdvance(phaser.arrive())); |
560 |
assertEquals(1, phaser.getPhase()); |
561 |
assertEquals(1, phaser.register()); |
562 |
List<Thread> threads = new ArrayList<Thread>(); |
563 |
for (int i = 0; i < 8; i++) { |
564 |
final CountDownLatch latch = new CountDownLatch(1); |
565 |
final boolean goesFirst = ((i & 1) == 0); |
566 |
threads.add(newStartedThread(new CheckedRunnable() { |
567 |
public void realRun() throws InterruptedException { |
568 |
if (goesFirst) |
569 |
latch.countDown(); |
570 |
else |
571 |
assertTrue(latch.await(SMALL_DELAY_MS, MILLISECONDS)); |
572 |
phaser.arrive(); |
573 |
}})); |
574 |
if (goesFirst) |
575 |
assertTrue(latch.await(SMALL_DELAY_MS, MILLISECONDS)); |
576 |
else |
577 |
latch.countDown(); |
578 |
assertEquals(i + 2, phaser.awaitAdvance(phaser.arrive())); |
579 |
assertEquals(i + 2, phaser.getPhase()); |
580 |
} |
581 |
for (Thread thread : threads) |
582 |
awaitTermination(thread, SMALL_DELAY_MS); |
583 |
} |
584 |
|
585 |
/** |
586 |
* awaitAdvance returns when the phaser is externally terminated |
587 |
*/ |
588 |
public void testAwaitAdvance6() throws InterruptedException { |
589 |
final Phaser phaser = new Phaser(3); |
590 |
final CountDownLatch threadsStarted = new CountDownLatch(2); |
591 |
final List<Thread> threads = new ArrayList<Thread>(); |
592 |
for (int i = 0; i < 2; i++) { |
593 |
Runnable r = new CheckedRunnable() { |
594 |
public void realRun() { |
595 |
assertEquals(0, phaser.arrive()); |
596 |
threadsStarted.countDown(); |
597 |
assertTrue(phaser.awaitAdvance(0) < 0); |
598 |
assertTrue(phaser.isTerminated()); |
599 |
assertTrue(phaser.getPhase() < 0); |
600 |
assertEquals(0, phaser.getPhase() + Integer.MIN_VALUE); |
601 |
assertEquals(3, phaser.getRegisteredParties()); |
602 |
}}; |
603 |
threads.add(newStartedThread(r)); |
604 |
} |
605 |
threadsStarted.await(); |
606 |
phaser.forceTermination(); |
607 |
assertEquals(0, phaser.getPhase() + Integer.MIN_VALUE); |
608 |
for (Thread thread : threads) |
609 |
awaitTermination(thread, SMALL_DELAY_MS); |
610 |
assertTrue(phaser.isTerminated()); |
611 |
assertTrue(phaser.getPhase() < 0); |
612 |
assertEquals(3, phaser.getRegisteredParties()); |
613 |
} |
614 |
|
615 |
/** |
616 |
* arriveAndAwaitAdvance throws IllegalStateException with no |
617 |
* unarrived parties |
618 |
*/ |
619 |
public void testArriveAndAwaitAdvance1() { |
620 |
try { |
621 |
Phaser phaser = new Phaser(); |
622 |
phaser.arriveAndAwaitAdvance(); |
623 |
shouldThrow(); |
624 |
} catch (IllegalStateException success) {} |
625 |
} |
626 |
|
627 |
/** |
628 |
* arriveAndAwaitAdvance waits for all threads to arrive, the |
629 |
* number of arrived parties is the same number that is accounted |
630 |
* for when the main thread awaitsAdvance |
631 |
*/ |
632 |
public void testArriveAndAwaitAdvance3() throws InterruptedException { |
633 |
final Phaser phaser = new Phaser(1); |
634 |
final int THREADS = 3; |
635 |
final CountDownLatch threadsStarted = new CountDownLatch(THREADS); |
636 |
final List<Thread> threads = new ArrayList<Thread>(); |
637 |
for (int i = 0; i < THREADS; i++) |
638 |
threads.add(newStartedThread(new CheckedRunnable() { |
639 |
public void realRun() throws InterruptedException { |
640 |
assertEquals(0, phaser.register()); |
641 |
threadsStarted.countDown(); |
642 |
assertEquals(1, phaser.arriveAndAwaitAdvance()); |
643 |
}})); |
644 |
|
645 |
assertTrue(threadsStarted.await(MEDIUM_DELAY_MS, MILLISECONDS)); |
646 |
long t0 = System.nanoTime(); |
647 |
while (phaser.getArrivedParties() < THREADS) |
648 |
Thread.yield(); |
649 |
assertEquals(THREADS, phaser.getArrivedParties()); |
650 |
assertTrue(NANOSECONDS.toMillis(System.nanoTime() - t0) < SMALL_DELAY_MS); |
651 |
for (Thread thread : threads) |
652 |
assertTrue(thread.isAlive()); |
653 |
assertState(phaser, 0, THREADS + 1, 1); |
654 |
phaser.arriveAndAwaitAdvance(); |
655 |
for (Thread thread : threads) |
656 |
awaitTermination(thread, SMALL_DELAY_MS); |
657 |
assertState(phaser, 1, THREADS + 1, THREADS + 1); |
658 |
} |
659 |
|
660 |
} |