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 |
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* Other contributors include Andrew Wright, Jeffrey Hayes, |
6 |
* Pat Fisher, Mike Judd. |
7 |
*/ |
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|
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import junit.framework.*; |
10 |
import java.util.*; |
11 |
import java.util.concurrent.*; |
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import java.util.concurrent.locks.*; |
13 |
import java.util.concurrent.atomic.*; |
14 |
|
15 |
public class CyclicBarrierTest extends JSR166TestCase{ |
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public static void main(String[] args) { |
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junit.textui.TestRunner.run (suite()); |
18 |
} |
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public static Test suite() { |
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return new TestSuite(CyclicBarrierTest.class); |
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} |
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|
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private volatile int countAction; |
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private class MyAction implements Runnable { |
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public void run() { ++countAction; } |
26 |
} |
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|
28 |
/** |
29 |
* Creating with negative parties throws IAE |
30 |
*/ |
31 |
public void testConstructor1() { |
32 |
try { |
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new CyclicBarrier(-1, (Runnable)null); |
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shouldThrow(); |
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} catch(IllegalArgumentException e){} |
36 |
} |
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|
38 |
/** |
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* Creating with negative parties and no action throws IAE |
40 |
*/ |
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public void testConstructor2() { |
42 |
try { |
43 |
new CyclicBarrier(-1); |
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shouldThrow(); |
45 |
} catch(IllegalArgumentException e){} |
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} |
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|
48 |
/** |
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* getParties returns the number of parties given in constructor |
50 |
*/ |
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public void testGetParties() { |
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CyclicBarrier b = new CyclicBarrier(2); |
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assertEquals(2, b.getParties()); |
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assertEquals(0, b.getNumberWaiting()); |
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} |
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|
57 |
/** |
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* A 1-party barrier triggers after single await |
59 |
*/ |
60 |
public void testSingleParty() { |
61 |
try { |
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CyclicBarrier b = new CyclicBarrier(1); |
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assertEquals(1, b.getParties()); |
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assertEquals(0, b.getNumberWaiting()); |
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b.await(); |
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b.await(); |
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assertEquals(0, b.getNumberWaiting()); |
68 |
} |
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catch(Exception e) { |
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unexpectedException(); |
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} |
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} |
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|
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/** |
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* The supplied barrier action is run at barrier |
76 |
*/ |
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public void testBarrierAction() { |
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try { |
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countAction = 0; |
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CyclicBarrier b = new CyclicBarrier(1, new MyAction()); |
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assertEquals(1, b.getParties()); |
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assertEquals(0, b.getNumberWaiting()); |
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b.await(); |
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b.await(); |
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assertEquals(0, b.getNumberWaiting()); |
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assertEquals(countAction, 2); |
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} |
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catch(Exception e) { |
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unexpectedException(); |
90 |
} |
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} |
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|
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/** |
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* A 2-party/thread barrier triggers after both threads invoke await |
95 |
*/ |
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public void testTwoParties() { |
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final CyclicBarrier b = new CyclicBarrier(2); |
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Thread t = new Thread(new Runnable() { |
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public void run() { |
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try { |
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b.await(); |
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b.await(); |
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b.await(); |
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b.await(); |
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} catch(Exception e){ |
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threadUnexpectedException(); |
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}}}); |
108 |
|
109 |
try { |
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t.start(); |
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b.await(); |
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b.await(); |
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b.await(); |
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b.await(); |
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t.join(); |
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} catch(Exception e){ |
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unexpectedException(); |
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} |
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} |
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|
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|
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/** |
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* An interruption in one party causes others waiting in await to |
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* throw BrokenBarrierException |
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*/ |
126 |
public void testAwait1_Interrupted_BrokenBarrier() { |
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final CyclicBarrier c = new CyclicBarrier(3); |
128 |
Thread t1 = new Thread(new Runnable() { |
129 |
public void run() { |
130 |
try { |
131 |
c.await(); |
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threadShouldThrow(); |
133 |
} catch(InterruptedException success){} |
134 |
catch(Exception b){ |
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threadUnexpectedException(); |
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} |
137 |
} |
138 |
}); |
139 |
Thread t2 = new Thread(new Runnable() { |
140 |
public void run() { |
141 |
try { |
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c.await(); |
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threadShouldThrow(); |
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} catch(BrokenBarrierException success){ |
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} catch(Exception i){ |
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threadUnexpectedException(); |
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} |
148 |
} |
149 |
}); |
150 |
try { |
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t1.start(); |
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t2.start(); |
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Thread.sleep(SHORT_DELAY_MS); |
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t1.interrupt(); |
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t1.join(); |
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t2.join(); |
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} catch(InterruptedException e){ |
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unexpectedException(); |
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} |
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} |
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|
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/** |
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* An interruption in one party causes others waiting in timed await to |
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* throw BrokenBarrierException |
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*/ |
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public void testAwait2_Interrupted_BrokenBarrier() { |
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final CyclicBarrier c = new CyclicBarrier(3); |
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Thread t1 = new Thread(new Runnable() { |
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public void run() { |
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try { |
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c.await(LONG_DELAY_MS, TimeUnit.MILLISECONDS); |
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threadShouldThrow(); |
173 |
} catch(InterruptedException success){ |
174 |
} catch(Exception b){ |
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threadUnexpectedException(); |
176 |
} |
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} |
178 |
}); |
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Thread t2 = new Thread(new Runnable() { |
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public void run() { |
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try { |
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c.await(LONG_DELAY_MS, TimeUnit.MILLISECONDS); |
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threadShouldThrow(); |
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} catch(BrokenBarrierException success){ |
185 |
} catch(Exception i){ |
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threadUnexpectedException(); |
187 |
} |
188 |
} |
189 |
}); |
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try { |
191 |
t1.start(); |
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t2.start(); |
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Thread.sleep(SHORT_DELAY_MS); |
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t1.interrupt(); |
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t1.join(); |
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t2.join(); |
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} catch(InterruptedException e){ |
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unexpectedException(); |
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} |
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} |
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|
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/** |
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* A timeout in timed await throws TimeoutException |
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*/ |
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public void testAwait3_TimeOutException() { |
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final CyclicBarrier c = new CyclicBarrier(2); |
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Thread t = new Thread(new Runnable() { |
208 |
public void run() { |
209 |
try { |
210 |
c.await(SHORT_DELAY_MS, TimeUnit.MILLISECONDS); |
211 |
threadShouldThrow(); |
212 |
} catch(TimeoutException success){ |
213 |
} catch(Exception b){ |
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threadUnexpectedException(); |
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|
216 |
} |
217 |
} |
218 |
}); |
219 |
try { |
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t.start(); |
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t.join(); |
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} catch(InterruptedException e){ |
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unexpectedException(); |
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} |
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} |
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|
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/** |
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* A timeout in one party causes others waiting in timed await to |
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* throw BrokenBarrierException |
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*/ |
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public void testAwait4_Timeout_BrokenBarrier() { |
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final CyclicBarrier c = new CyclicBarrier(3); |
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Thread t1 = new Thread(new Runnable() { |
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public void run() { |
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try { |
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c.await(SHORT_DELAY_MS, TimeUnit.MILLISECONDS); |
237 |
threadShouldThrow(); |
238 |
} catch(TimeoutException success){ |
239 |
} catch(Exception b){ |
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threadUnexpectedException(); |
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} |
242 |
} |
243 |
}); |
244 |
Thread t2 = new Thread(new Runnable() { |
245 |
public void run() { |
246 |
try { |
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c.await(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS); |
248 |
threadShouldThrow(); |
249 |
} catch(BrokenBarrierException success){ |
250 |
} catch(Exception i){ |
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threadUnexpectedException(); |
252 |
} |
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} |
254 |
}); |
255 |
try { |
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t1.start(); |
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t2.start(); |
258 |
t1.join(); |
259 |
t2.join(); |
260 |
} catch(InterruptedException e){ |
261 |
unexpectedException(); |
262 |
} |
263 |
} |
264 |
|
265 |
/** |
266 |
* A timeout in one party causes others waiting in await to |
267 |
* throw BrokenBarrierException |
268 |
*/ |
269 |
public void testAwait5_Timeout_BrokenBarrier() { |
270 |
final CyclicBarrier c = new CyclicBarrier(3); |
271 |
Thread t1 = new Thread(new Runnable() { |
272 |
public void run() { |
273 |
try { |
274 |
c.await(SHORT_DELAY_MS, TimeUnit.MILLISECONDS); |
275 |
threadShouldThrow(); |
276 |
} catch(TimeoutException success){ |
277 |
} catch(Exception b){ |
278 |
threadUnexpectedException(); |
279 |
} |
280 |
} |
281 |
}); |
282 |
Thread t2 = new Thread(new Runnable() { |
283 |
public void run() { |
284 |
try { |
285 |
c.await(); |
286 |
threadShouldThrow(); |
287 |
} catch(BrokenBarrierException success){ |
288 |
} catch(Exception i){ |
289 |
threadUnexpectedException(); |
290 |
} |
291 |
} |
292 |
}); |
293 |
try { |
294 |
t1.start(); |
295 |
t2.start(); |
296 |
t1.join(); |
297 |
t2.join(); |
298 |
} catch(InterruptedException e){ |
299 |
unexpectedException(); |
300 |
} |
301 |
} |
302 |
|
303 |
/** |
304 |
* A reset of an active barrier causes waiting threads to throw |
305 |
* BrokenBarrierException |
306 |
*/ |
307 |
public void testReset_BrokenBarrier() { |
308 |
final CyclicBarrier c = new CyclicBarrier(3); |
309 |
Thread t1 = new Thread(new Runnable() { |
310 |
public void run() { |
311 |
try { |
312 |
c.await(); |
313 |
threadShouldThrow(); |
314 |
} catch(BrokenBarrierException success){} |
315 |
catch(Exception b){ |
316 |
threadUnexpectedException(); |
317 |
} |
318 |
} |
319 |
}); |
320 |
Thread t2 = new Thread(new Runnable() { |
321 |
public void run() { |
322 |
try { |
323 |
c.await(); |
324 |
threadShouldThrow(); |
325 |
} catch(BrokenBarrierException success){ |
326 |
} catch(Exception i){ |
327 |
threadUnexpectedException(); |
328 |
} |
329 |
} |
330 |
}); |
331 |
try { |
332 |
t1.start(); |
333 |
t2.start(); |
334 |
Thread.sleep(SHORT_DELAY_MS); |
335 |
c.reset(); |
336 |
t1.join(); |
337 |
t2.join(); |
338 |
} catch(InterruptedException e){ |
339 |
unexpectedException(); |
340 |
} |
341 |
} |
342 |
|
343 |
/** |
344 |
* A reset before threads enter barrier does not throw |
345 |
* BrokenBarrierException |
346 |
*/ |
347 |
public void testReset_NoBrokenBarrier() { |
348 |
final CyclicBarrier c = new CyclicBarrier(3); |
349 |
Thread t1 = new Thread(new Runnable() { |
350 |
public void run() { |
351 |
try { |
352 |
c.await(); |
353 |
} catch(Exception b){ |
354 |
threadUnexpectedException(); |
355 |
} |
356 |
} |
357 |
}); |
358 |
Thread t2 = new Thread(new Runnable() { |
359 |
public void run() { |
360 |
try { |
361 |
c.await(); |
362 |
} catch(Exception i){ |
363 |
threadUnexpectedException(); |
364 |
} |
365 |
} |
366 |
}); |
367 |
try { |
368 |
c.reset(); |
369 |
t1.start(); |
370 |
t2.start(); |
371 |
c.await(); |
372 |
t1.join(); |
373 |
t2.join(); |
374 |
} catch(Exception e){ |
375 |
unexpectedException(); |
376 |
} |
377 |
} |
378 |
|
379 |
/** |
380 |
* All threads block while a barrier is broken. |
381 |
*/ |
382 |
public void testReset_Leakage() { |
383 |
try { |
384 |
final CyclicBarrier c = new CyclicBarrier(2); |
385 |
final AtomicBoolean done = new AtomicBoolean(); |
386 |
Thread t = new Thread() { |
387 |
public void run() { |
388 |
while (!done.get()) { |
389 |
try { |
390 |
while (c.isBroken()) |
391 |
c.reset(); |
392 |
|
393 |
c.await(); |
394 |
threadFail("await should not return"); |
395 |
} |
396 |
catch (BrokenBarrierException e) { |
397 |
} |
398 |
catch (InterruptedException ie) { |
399 |
} |
400 |
} |
401 |
} |
402 |
}; |
403 |
|
404 |
t.start(); |
405 |
for( int i = 0; i < 4; i++) { |
406 |
Thread.sleep(SHORT_DELAY_MS); |
407 |
t.interrupt(); |
408 |
} |
409 |
done.set(true); |
410 |
t.interrupt(); |
411 |
} |
412 |
catch (Exception ex) { |
413 |
unexpectedException(); |
414 |
} |
415 |
} |
416 |
|
417 |
/** |
418 |
* Reset of a non-broken barrier does not break barrier |
419 |
*/ |
420 |
public void testResetWithoutBreakage() { |
421 |
try { |
422 |
final CyclicBarrier start = new CyclicBarrier(3); |
423 |
final CyclicBarrier barrier = new CyclicBarrier(3); |
424 |
for (int i = 0; i < 3; i++) { |
425 |
Thread t1 = new Thread(new Runnable() { |
426 |
public void run() { |
427 |
try { start.await(); } |
428 |
catch (Exception ie) { |
429 |
threadFail("start barrier"); |
430 |
} |
431 |
try { barrier.await(); } |
432 |
catch (Throwable thrown) { |
433 |
unexpectedException(); |
434 |
}}}); |
435 |
|
436 |
Thread t2 = new Thread(new Runnable() { |
437 |
public void run() { |
438 |
try { start.await(); } |
439 |
catch (Exception ie) { |
440 |
threadFail("start barrier"); |
441 |
} |
442 |
try { barrier.await(); } |
443 |
catch (Throwable thrown) { |
444 |
unexpectedException(); |
445 |
}}}); |
446 |
|
447 |
|
448 |
t1.start(); |
449 |
t2.start(); |
450 |
try { start.await(); } |
451 |
catch (Exception ie) { threadFail("start barrier"); } |
452 |
barrier.await(); |
453 |
t1.join(); |
454 |
t2.join(); |
455 |
assertFalse(barrier.isBroken()); |
456 |
assertEquals(0, barrier.getNumberWaiting()); |
457 |
if (i == 1) barrier.reset(); |
458 |
assertFalse(barrier.isBroken()); |
459 |
assertEquals(0, barrier.getNumberWaiting()); |
460 |
} |
461 |
} |
462 |
catch (Exception ex) { |
463 |
unexpectedException(); |
464 |
} |
465 |
} |
466 |
|
467 |
/** |
468 |
* Reset of a barrier after interruption reinitializes it. |
469 |
*/ |
470 |
public void testResetAfterInterrupt() { |
471 |
try { |
472 |
final CyclicBarrier start = new CyclicBarrier(3); |
473 |
final CyclicBarrier barrier = new CyclicBarrier(3); |
474 |
for (int i = 0; i < 2; i++) { |
475 |
Thread t1 = new Thread(new Runnable() { |
476 |
public void run() { |
477 |
try { start.await(); } |
478 |
catch (Exception ie) { |
479 |
threadFail("start barrier"); |
480 |
} |
481 |
try { barrier.await(); } |
482 |
catch(InterruptedException ok) {} |
483 |
catch (Throwable thrown) { |
484 |
unexpectedException(); |
485 |
}}}); |
486 |
|
487 |
Thread t2 = new Thread(new Runnable() { |
488 |
public void run() { |
489 |
try { start.await(); } |
490 |
catch (Exception ie) { |
491 |
threadFail("start barrier"); |
492 |
} |
493 |
try { barrier.await(); } |
494 |
catch(BrokenBarrierException ok) {} |
495 |
catch (Throwable thrown) { |
496 |
unexpectedException(); |
497 |
}}}); |
498 |
|
499 |
t1.start(); |
500 |
t2.start(); |
501 |
try { start.await(); } |
502 |
catch (Exception ie) { threadFail("start barrier"); } |
503 |
t1.interrupt(); |
504 |
t1.join(); |
505 |
t2.join(); |
506 |
assertTrue(barrier.isBroken()); |
507 |
assertEquals(0, barrier.getNumberWaiting()); |
508 |
barrier.reset(); |
509 |
assertFalse(barrier.isBroken()); |
510 |
assertEquals(0, barrier.getNumberWaiting()); |
511 |
} |
512 |
} |
513 |
catch (Exception ex) { |
514 |
unexpectedException(); |
515 |
} |
516 |
} |
517 |
|
518 |
/** |
519 |
* Reset of a barrier after timeout reinitializes it. |
520 |
*/ |
521 |
public void testResetAfterTimeout() { |
522 |
try { |
523 |
final CyclicBarrier start = new CyclicBarrier(3); |
524 |
final CyclicBarrier barrier = new CyclicBarrier(3); |
525 |
for (int i = 0; i < 2; i++) { |
526 |
Thread t1 = new Thread(new Runnable() { |
527 |
public void run() { |
528 |
try { start.await(); } |
529 |
catch (Exception ie) { |
530 |
threadFail("start barrier"); |
531 |
} |
532 |
try { barrier.await(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS); } |
533 |
catch(TimeoutException ok) {} |
534 |
catch (Throwable thrown) { |
535 |
unexpectedException(); |
536 |
}}}); |
537 |
|
538 |
Thread t2 = new Thread(new Runnable() { |
539 |
public void run() { |
540 |
try { start.await(); } |
541 |
catch (Exception ie) { |
542 |
threadFail("start barrier"); |
543 |
} |
544 |
try { barrier.await(); } |
545 |
catch(BrokenBarrierException ok) {} |
546 |
catch (Throwable thrown) { |
547 |
unexpectedException(); |
548 |
}}}); |
549 |
|
550 |
t1.start(); |
551 |
t2.start(); |
552 |
try { start.await(); } |
553 |
catch (Exception ie) { threadFail("start barrier"); } |
554 |
t1.join(); |
555 |
t2.join(); |
556 |
assertTrue(barrier.isBroken()); |
557 |
assertEquals(0, barrier.getNumberWaiting()); |
558 |
barrier.reset(); |
559 |
assertFalse(barrier.isBroken()); |
560 |
assertEquals(0, barrier.getNumberWaiting()); |
561 |
} |
562 |
} |
563 |
catch (Exception ex) { |
564 |
unexpectedException(); |
565 |
} |
566 |
} |
567 |
|
568 |
|
569 |
/** |
570 |
* Reset of a barrier after a failed command reinitializes it. |
571 |
*/ |
572 |
public void testResetAfterCommandException() { |
573 |
try { |
574 |
final CyclicBarrier start = new CyclicBarrier(3); |
575 |
final CyclicBarrier barrier = |
576 |
new CyclicBarrier(3, new Runnable() { |
577 |
public void run() { |
578 |
throw new NullPointerException(); }}); |
579 |
for (int i = 0; i < 2; i++) { |
580 |
Thread t1 = new Thread(new Runnable() { |
581 |
public void run() { |
582 |
try { start.await(); } |
583 |
catch (Exception ie) { |
584 |
threadFail("start barrier"); |
585 |
} |
586 |
try { barrier.await(); } |
587 |
catch(BrokenBarrierException ok) {} |
588 |
catch (Throwable thrown) { |
589 |
unexpectedException(); |
590 |
}}}); |
591 |
|
592 |
Thread t2 = new Thread(new Runnable() { |
593 |
public void run() { |
594 |
try { start.await(); } |
595 |
catch (Exception ie) { |
596 |
threadFail("start barrier"); |
597 |
} |
598 |
try { barrier.await(); } |
599 |
catch(BrokenBarrierException ok) {} |
600 |
catch (Throwable thrown) { |
601 |
unexpectedException(); |
602 |
}}}); |
603 |
|
604 |
t1.start(); |
605 |
t2.start(); |
606 |
try { start.await(); } |
607 |
catch (Exception ie) { threadFail("start barrier"); } |
608 |
while (barrier.getNumberWaiting() < 2) { Thread.yield(); } |
609 |
try { barrier.await(); } |
610 |
catch (Exception ok) { } |
611 |
t1.join(); |
612 |
t2.join(); |
613 |
assertTrue(barrier.isBroken()); |
614 |
assertEquals(0, barrier.getNumberWaiting()); |
615 |
barrier.reset(); |
616 |
assertFalse(barrier.isBroken()); |
617 |
assertEquals(0, barrier.getNumberWaiting()); |
618 |
} |
619 |
} |
620 |
catch (Exception ex) { |
621 |
unexpectedException(); |
622 |
} |
623 |
} |
624 |
} |