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 |
*/ |
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|
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import static java.util.concurrent.TimeUnit.MILLISECONDS; |
10 |
import static java.util.concurrent.TimeUnit.NANOSECONDS; |
11 |
|
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import java.util.ArrayList; |
13 |
import java.util.List; |
14 |
import java.util.NoSuchElementException; |
15 |
import java.util.concurrent.Callable; |
16 |
import java.util.concurrent.CancellationException; |
17 |
import java.util.concurrent.CountDownLatch; |
18 |
import java.util.concurrent.ExecutionException; |
19 |
import java.util.concurrent.Executors; |
20 |
import java.util.concurrent.ExecutorService; |
21 |
import java.util.concurrent.Future; |
22 |
import java.util.concurrent.FutureTask; |
23 |
import java.util.concurrent.TimeoutException; |
24 |
import java.util.concurrent.atomic.AtomicInteger; |
25 |
|
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import junit.framework.Test; |
27 |
import junit.framework.TestSuite; |
28 |
|
29 |
public class FutureTaskTest extends JSR166TestCase { |
30 |
|
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public static void main(String[] args) { |
32 |
main(suite(), args); |
33 |
} |
34 |
public static Test suite() { |
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return new TestSuite(FutureTaskTest.class); |
36 |
} |
37 |
|
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void checkIsDone(Future<?> f) { |
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assertTrue(f.isDone()); |
40 |
assertFalse(f.cancel(false)); |
41 |
assertFalse(f.cancel(true)); |
42 |
if (f instanceof PublicFutureTask) { |
43 |
PublicFutureTask pf = (PublicFutureTask) f; |
44 |
assertEquals(1, pf.doneCount()); |
45 |
assertFalse(pf.runAndReset()); |
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assertEquals(1, pf.doneCount()); |
47 |
Object r = null; Object exInfo = null; |
48 |
try { |
49 |
r = f.get(); |
50 |
} catch (CancellationException t) { |
51 |
exInfo = CancellationException.class; |
52 |
} catch (ExecutionException t) { |
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exInfo = t.getCause(); |
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} catch (Throwable t) { |
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threadUnexpectedException(t); |
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} |
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|
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// Check that run and runAndReset have no effect. |
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int savedRunCount = pf.runCount(); |
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pf.run(); |
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pf.runAndReset(); |
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assertEquals(savedRunCount, pf.runCount()); |
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Object r2 = null; |
64 |
try { |
65 |
r2 = f.get(); |
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} catch (CancellationException t) { |
67 |
assertSame(exInfo, CancellationException.class); |
68 |
} catch (ExecutionException t) { |
69 |
assertSame(exInfo, t.getCause()); |
70 |
} catch (Throwable t) { |
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threadUnexpectedException(t); |
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} |
73 |
if (exInfo == null) |
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assertSame(r, r2); |
75 |
assertTrue(f.isDone()); |
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} |
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} |
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|
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void checkNotDone(Future<?> f) { |
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assertFalse(f.isDone()); |
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assertFalse(f.isCancelled()); |
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if (f instanceof PublicFutureTask) { |
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PublicFutureTask pf = (PublicFutureTask) f; |
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assertEquals(0, pf.doneCount()); |
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assertEquals(0, pf.setCount()); |
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assertEquals(0, pf.setExceptionCount()); |
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} |
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} |
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|
90 |
void checkIsRunning(Future<?> f) { |
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checkNotDone(f); |
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if (f instanceof FutureTask) { |
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FutureTask<?> ft = (FutureTask<?>) f; |
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// Check that run methods do nothing |
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ft.run(); |
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if (f instanceof PublicFutureTask) { |
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PublicFutureTask pf = (PublicFutureTask) f; |
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int savedRunCount = pf.runCount(); |
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pf.run(); |
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assertFalse(pf.runAndReset()); |
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assertEquals(savedRunCount, pf.runCount()); |
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} |
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checkNotDone(f); |
104 |
} |
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} |
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|
107 |
<T> void checkCompletedNormally(Future<T> f, T expectedValue) { |
108 |
checkIsDone(f); |
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assertFalse(f.isCancelled()); |
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|
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T v1 = null, v2 = null; |
112 |
try { |
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v1 = f.get(); |
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v2 = f.get(randomTimeout(), randomTimeUnit()); |
115 |
} catch (Throwable fail) { threadUnexpectedException(fail); } |
116 |
assertSame(expectedValue, v1); |
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assertSame(expectedValue, v2); |
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} |
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|
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void checkCancelled(Future<?> f) { |
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checkIsDone(f); |
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assertTrue(f.isCancelled()); |
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|
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try { |
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f.get(); |
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shouldThrow(); |
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} catch (CancellationException success) { |
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} catch (Throwable fail) { threadUnexpectedException(fail); } |
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|
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try { |
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f.get(randomTimeout(), randomTimeUnit()); |
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shouldThrow(); |
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} catch (CancellationException success) { |
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} catch (Throwable fail) { threadUnexpectedException(fail); } |
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} |
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|
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void tryToConfuseDoneTask(PublicFutureTask pf) { |
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pf.set(new Object()); |
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pf.setException(new Error()); |
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for (boolean mayInterruptIfRunning : new boolean[] { true, false }) { |
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pf.cancel(mayInterruptIfRunning); |
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} |
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} |
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|
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void checkCompletedAbnormally(Future<?> f, Throwable t) { |
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checkIsDone(f); |
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assertFalse(f.isCancelled()); |
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|
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try { |
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f.get(); |
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shouldThrow(); |
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} catch (ExecutionException success) { |
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assertSame(t, success.getCause()); |
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} catch (Throwable fail) { threadUnexpectedException(fail); } |
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|
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try { |
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f.get(randomTimeout(), randomTimeUnit()); |
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shouldThrow(); |
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} catch (ExecutionException success) { |
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assertSame(t, success.getCause()); |
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} catch (Throwable fail) { threadUnexpectedException(fail); } |
162 |
} |
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|
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/** |
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* Subclass to expose protected methods |
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*/ |
167 |
static class PublicFutureTask extends FutureTask<Object> { |
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private final AtomicInteger runCount; |
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private final AtomicInteger doneCount = new AtomicInteger(0); |
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private final AtomicInteger runAndResetCount = new AtomicInteger(0); |
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private final AtomicInteger setCount = new AtomicInteger(0); |
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private final AtomicInteger setExceptionCount = new AtomicInteger(0); |
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public int runCount() { return runCount.get(); } |
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public int doneCount() { return doneCount.get(); } |
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public int runAndResetCount() { return runAndResetCount.get(); } |
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public int setCount() { return setCount.get(); } |
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public int setExceptionCount() { return setExceptionCount.get(); } |
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|
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PublicFutureTask(Runnable runnable) { |
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this(runnable, seven); |
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} |
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PublicFutureTask(Runnable runnable, Object result) { |
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this(runnable, result, new AtomicInteger(0)); |
184 |
} |
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private PublicFutureTask(final Runnable runnable, Object result, |
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final AtomicInteger runCount) { |
187 |
super(new Runnable() { |
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public void run() { |
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runCount.getAndIncrement(); |
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runnable.run(); |
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}}, result); |
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this.runCount = runCount; |
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} |
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PublicFutureTask(Callable<?> callable) { |
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this(callable, new AtomicInteger(0)); |
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} |
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private PublicFutureTask(final Callable<?> callable, |
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final AtomicInteger runCount) { |
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super(new Callable<Object>() { |
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public Object call() throws Exception { |
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runCount.getAndIncrement(); |
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return callable.call(); |
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}}); |
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this.runCount = runCount; |
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} |
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@Override public void done() { |
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assertTrue(isDone()); |
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doneCount.incrementAndGet(); |
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super.done(); |
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} |
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@Override public boolean runAndReset() { |
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runAndResetCount.incrementAndGet(); |
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return super.runAndReset(); |
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} |
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@Override public void set(Object x) { |
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setCount.incrementAndGet(); |
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super.set(x); |
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} |
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@Override public void setException(Throwable t) { |
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setExceptionCount.incrementAndGet(); |
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super.setException(t); |
222 |
} |
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} |
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|
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class Counter extends CheckedRunnable { |
226 |
final AtomicInteger count = new AtomicInteger(0); |
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public int get() { return count.get(); } |
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public void realRun() { |
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count.getAndIncrement(); |
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} |
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} |
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|
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/** |
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* creating a future with a null callable throws NullPointerException |
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*/ |
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public void testConstructor() { |
237 |
try { |
238 |
new FutureTask<Void>(null); |
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shouldThrow(); |
240 |
} catch (NullPointerException success) {} |
241 |
} |
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|
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/** |
244 |
* creating a future with null runnable throws NullPointerException |
245 |
*/ |
246 |
public void testConstructor2() { |
247 |
try { |
248 |
new FutureTask<Boolean>(null, Boolean.TRUE); |
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shouldThrow(); |
250 |
} catch (NullPointerException success) {} |
251 |
} |
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|
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/** |
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* isDone is true when a task completes |
255 |
*/ |
256 |
public void testIsDone() { |
257 |
PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
258 |
assertFalse(task.isDone()); |
259 |
task.run(); |
260 |
assertTrue(task.isDone()); |
261 |
checkCompletedNormally(task, Boolean.TRUE); |
262 |
assertEquals(1, task.runCount()); |
263 |
} |
264 |
|
265 |
/** |
266 |
* runAndReset of a non-cancelled task succeeds |
267 |
*/ |
268 |
public void testRunAndReset() { |
269 |
PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
270 |
for (int i = 0; i < 3; i++) { |
271 |
assertTrue(task.runAndReset()); |
272 |
checkNotDone(task); |
273 |
assertEquals(i + 1, task.runCount()); |
274 |
assertEquals(i + 1, task.runAndResetCount()); |
275 |
assertEquals(0, task.setCount()); |
276 |
assertEquals(0, task.setExceptionCount()); |
277 |
} |
278 |
} |
279 |
|
280 |
/** |
281 |
* runAndReset after cancellation fails |
282 |
*/ |
283 |
public void testRunAndResetAfterCancel() { |
284 |
for (boolean mayInterruptIfRunning : new boolean[] { true, false }) { |
285 |
PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
286 |
assertTrue(task.cancel(mayInterruptIfRunning)); |
287 |
for (int i = 0; i < 3; i++) { |
288 |
assertFalse(task.runAndReset()); |
289 |
assertEquals(0, task.runCount()); |
290 |
assertEquals(i + 1, task.runAndResetCount()); |
291 |
assertEquals(0, task.setCount()); |
292 |
assertEquals(0, task.setExceptionCount()); |
293 |
} |
294 |
tryToConfuseDoneTask(task); |
295 |
checkCancelled(task); |
296 |
} |
297 |
} |
298 |
|
299 |
/** |
300 |
* setting value causes get to return it |
301 |
*/ |
302 |
public void testSet() throws Exception { |
303 |
PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
304 |
task.set(one); |
305 |
for (int i = 0; i < 3; i++) { |
306 |
assertSame(one, task.get()); |
307 |
assertSame(one, task.get(LONG_DELAY_MS, MILLISECONDS)); |
308 |
assertEquals(1, task.setCount()); |
309 |
} |
310 |
tryToConfuseDoneTask(task); |
311 |
checkCompletedNormally(task, one); |
312 |
assertEquals(0, task.runCount()); |
313 |
} |
314 |
|
315 |
/** |
316 |
* setException causes get to throw ExecutionException |
317 |
*/ |
318 |
public void testSetException_get() throws Exception { |
319 |
Exception nse = new NoSuchElementException(); |
320 |
PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
321 |
task.setException(nse); |
322 |
|
323 |
try { |
324 |
task.get(); |
325 |
shouldThrow(); |
326 |
} catch (ExecutionException success) { |
327 |
assertSame(nse, success.getCause()); |
328 |
checkCompletedAbnormally(task, nse); |
329 |
} |
330 |
|
331 |
try { |
332 |
task.get(LONG_DELAY_MS, MILLISECONDS); |
333 |
shouldThrow(); |
334 |
} catch (ExecutionException success) { |
335 |
assertSame(nse, success.getCause()); |
336 |
checkCompletedAbnormally(task, nse); |
337 |
} |
338 |
|
339 |
assertEquals(1, task.setExceptionCount()); |
340 |
assertEquals(0, task.setCount()); |
341 |
tryToConfuseDoneTask(task); |
342 |
checkCompletedAbnormally(task, nse); |
343 |
assertEquals(0, task.runCount()); |
344 |
} |
345 |
|
346 |
/** |
347 |
* cancel(false) before run succeeds |
348 |
*/ |
349 |
public void testCancelBeforeRun() { |
350 |
PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
351 |
assertTrue(task.cancel(false)); |
352 |
task.run(); |
353 |
assertEquals(0, task.runCount()); |
354 |
assertEquals(0, task.setCount()); |
355 |
assertEquals(0, task.setExceptionCount()); |
356 |
assertTrue(task.isCancelled()); |
357 |
assertTrue(task.isDone()); |
358 |
tryToConfuseDoneTask(task); |
359 |
assertEquals(0, task.runCount()); |
360 |
checkCancelled(task); |
361 |
} |
362 |
|
363 |
/** |
364 |
* cancel(true) before run succeeds |
365 |
*/ |
366 |
public void testCancelBeforeRun2() { |
367 |
PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
368 |
assertTrue(task.cancel(true)); |
369 |
task.run(); |
370 |
assertEquals(0, task.runCount()); |
371 |
assertEquals(0, task.setCount()); |
372 |
assertEquals(0, task.setExceptionCount()); |
373 |
assertTrue(task.isCancelled()); |
374 |
assertTrue(task.isDone()); |
375 |
tryToConfuseDoneTask(task); |
376 |
assertEquals(0, task.runCount()); |
377 |
checkCancelled(task); |
378 |
} |
379 |
|
380 |
/** |
381 |
* cancel(false) of a completed task fails |
382 |
*/ |
383 |
public void testCancelAfterRun() { |
384 |
PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
385 |
task.run(); |
386 |
assertFalse(task.cancel(false)); |
387 |
assertEquals(1, task.runCount()); |
388 |
assertEquals(1, task.setCount()); |
389 |
assertEquals(0, task.setExceptionCount()); |
390 |
tryToConfuseDoneTask(task); |
391 |
checkCompletedNormally(task, Boolean.TRUE); |
392 |
assertEquals(1, task.runCount()); |
393 |
} |
394 |
|
395 |
/** |
396 |
* cancel(true) of a completed task fails |
397 |
*/ |
398 |
public void testCancelAfterRun2() { |
399 |
PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
400 |
task.run(); |
401 |
assertFalse(task.cancel(true)); |
402 |
assertEquals(1, task.runCount()); |
403 |
assertEquals(1, task.setCount()); |
404 |
assertEquals(0, task.setExceptionCount()); |
405 |
tryToConfuseDoneTask(task); |
406 |
checkCompletedNormally(task, Boolean.TRUE); |
407 |
assertEquals(1, task.runCount()); |
408 |
} |
409 |
|
410 |
/** |
411 |
* cancel(true) interrupts a running task that subsequently succeeds |
412 |
*/ |
413 |
public void testCancelInterrupt() { |
414 |
final CountDownLatch pleaseCancel = new CountDownLatch(1); |
415 |
final PublicFutureTask task = |
416 |
new PublicFutureTask(new CheckedRunnable() { |
417 |
public void realRun() { |
418 |
pleaseCancel.countDown(); |
419 |
try { |
420 |
delay(LONG_DELAY_MS); |
421 |
shouldThrow(); |
422 |
} catch (InterruptedException success) {} |
423 |
assertFalse(Thread.interrupted()); |
424 |
}}); |
425 |
|
426 |
Thread t = newStartedThread(task); |
427 |
await(pleaseCancel); |
428 |
assertTrue(task.cancel(true)); |
429 |
assertTrue(task.isCancelled()); |
430 |
assertTrue(task.isDone()); |
431 |
awaitTermination(t); |
432 |
assertEquals(1, task.runCount()); |
433 |
assertEquals(1, task.setCount()); |
434 |
assertEquals(0, task.setExceptionCount()); |
435 |
tryToConfuseDoneTask(task); |
436 |
checkCancelled(task); |
437 |
} |
438 |
|
439 |
/** |
440 |
* cancel(true) tries to interrupt a running task, but |
441 |
* Thread.interrupt throws (simulating a restrictive security |
442 |
* manager) |
443 |
*/ |
444 |
public void testCancelInterrupt_ThrowsSecurityException() { |
445 |
final CountDownLatch pleaseCancel = new CountDownLatch(1); |
446 |
final CountDownLatch cancelled = new CountDownLatch(1); |
447 |
final PublicFutureTask task = |
448 |
new PublicFutureTask(new CheckedRunnable() { |
449 |
public void realRun() { |
450 |
pleaseCancel.countDown(); |
451 |
await(cancelled); |
452 |
assertFalse(Thread.interrupted()); |
453 |
}}); |
454 |
|
455 |
final Thread t = new Thread(task) { |
456 |
// Simulate a restrictive security manager. |
457 |
@Override public void interrupt() { |
458 |
throw new SecurityException(); |
459 |
}}; |
460 |
t.setDaemon(true); |
461 |
t.start(); |
462 |
|
463 |
await(pleaseCancel); |
464 |
try { |
465 |
task.cancel(true); |
466 |
shouldThrow(); |
467 |
} catch (SecurityException success) {} |
468 |
|
469 |
// We failed to deliver the interrupt, but the world retains |
470 |
// its sanity, as if we had done task.cancel(false) |
471 |
assertTrue(task.isCancelled()); |
472 |
assertTrue(task.isDone()); |
473 |
assertEquals(1, task.runCount()); |
474 |
assertEquals(1, task.doneCount()); |
475 |
assertEquals(0, task.setCount()); |
476 |
assertEquals(0, task.setExceptionCount()); |
477 |
cancelled.countDown(); |
478 |
awaitTermination(t); |
479 |
assertEquals(1, task.setCount()); |
480 |
assertEquals(0, task.setExceptionCount()); |
481 |
tryToConfuseDoneTask(task); |
482 |
checkCancelled(task); |
483 |
} |
484 |
|
485 |
/** |
486 |
* cancel(true) interrupts a running task that subsequently throws |
487 |
*/ |
488 |
public void testCancelInterrupt_taskFails() { |
489 |
final CountDownLatch pleaseCancel = new CountDownLatch(1); |
490 |
final PublicFutureTask task = |
491 |
new PublicFutureTask(new Runnable() { |
492 |
public void run() { |
493 |
pleaseCancel.countDown(); |
494 |
try { |
495 |
delay(LONG_DELAY_MS); |
496 |
threadShouldThrow(); |
497 |
} catch (InterruptedException success) { |
498 |
} catch (Throwable t) { threadUnexpectedException(t); } |
499 |
throw new RuntimeException(); |
500 |
}}); |
501 |
|
502 |
Thread t = newStartedThread(task); |
503 |
await(pleaseCancel); |
504 |
assertTrue(task.cancel(true)); |
505 |
assertTrue(task.isCancelled()); |
506 |
awaitTermination(t); |
507 |
assertEquals(1, task.runCount()); |
508 |
assertEquals(0, task.setCount()); |
509 |
assertEquals(1, task.setExceptionCount()); |
510 |
tryToConfuseDoneTask(task); |
511 |
checkCancelled(task); |
512 |
} |
513 |
|
514 |
/** |
515 |
* cancel(false) does not interrupt a running task |
516 |
*/ |
517 |
public void testCancelNoInterrupt() { |
518 |
final CountDownLatch pleaseCancel = new CountDownLatch(1); |
519 |
final CountDownLatch cancelled = new CountDownLatch(1); |
520 |
final PublicFutureTask task = |
521 |
new PublicFutureTask(new CheckedCallable<Boolean>() { |
522 |
public Boolean realCall() { |
523 |
pleaseCancel.countDown(); |
524 |
await(cancelled); |
525 |
assertFalse(Thread.interrupted()); |
526 |
return Boolean.TRUE; |
527 |
}}); |
528 |
|
529 |
Thread t = newStartedThread(task); |
530 |
await(pleaseCancel); |
531 |
assertTrue(task.cancel(false)); |
532 |
assertTrue(task.isCancelled()); |
533 |
cancelled.countDown(); |
534 |
awaitTermination(t); |
535 |
assertEquals(1, task.runCount()); |
536 |
assertEquals(1, task.setCount()); |
537 |
assertEquals(0, task.setExceptionCount()); |
538 |
tryToConfuseDoneTask(task); |
539 |
checkCancelled(task); |
540 |
} |
541 |
|
542 |
/** |
543 |
* run in one thread causes get in another thread to retrieve value |
544 |
*/ |
545 |
public void testGetRun() { |
546 |
final CountDownLatch pleaseRun = new CountDownLatch(2); |
547 |
|
548 |
final PublicFutureTask task = |
549 |
new PublicFutureTask(new CheckedCallable<Object>() { |
550 |
public Object realCall() { |
551 |
return two; |
552 |
}}); |
553 |
|
554 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
555 |
public void realRun() throws Exception { |
556 |
pleaseRun.countDown(); |
557 |
assertSame(two, task.get()); |
558 |
}}); |
559 |
|
560 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
561 |
public void realRun() throws Exception { |
562 |
pleaseRun.countDown(); |
563 |
assertSame(two, task.get(2*LONG_DELAY_MS, MILLISECONDS)); |
564 |
}}); |
565 |
|
566 |
await(pleaseRun); |
567 |
checkNotDone(task); |
568 |
assertTrue(t1.isAlive()); |
569 |
assertTrue(t2.isAlive()); |
570 |
task.run(); |
571 |
checkCompletedNormally(task, two); |
572 |
assertEquals(1, task.runCount()); |
573 |
assertEquals(1, task.setCount()); |
574 |
assertEquals(0, task.setExceptionCount()); |
575 |
awaitTermination(t1); |
576 |
awaitTermination(t2); |
577 |
tryToConfuseDoneTask(task); |
578 |
checkCompletedNormally(task, two); |
579 |
} |
580 |
|
581 |
/** |
582 |
* set in one thread causes get in another thread to retrieve value |
583 |
*/ |
584 |
public void testGetSet() { |
585 |
final CountDownLatch pleaseSet = new CountDownLatch(2); |
586 |
|
587 |
final PublicFutureTask task = |
588 |
new PublicFutureTask(new CheckedCallable<Object>() { |
589 |
public Object realCall() throws InterruptedException { |
590 |
return two; |
591 |
}}); |
592 |
|
593 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
594 |
public void realRun() throws Exception { |
595 |
pleaseSet.countDown(); |
596 |
assertSame(two, task.get()); |
597 |
}}); |
598 |
|
599 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
600 |
public void realRun() throws Exception { |
601 |
pleaseSet.countDown(); |
602 |
assertSame(two, task.get(2*LONG_DELAY_MS, MILLISECONDS)); |
603 |
}}); |
604 |
|
605 |
await(pleaseSet); |
606 |
checkNotDone(task); |
607 |
assertTrue(t1.isAlive()); |
608 |
assertTrue(t2.isAlive()); |
609 |
task.set(two); |
610 |
assertEquals(0, task.runCount()); |
611 |
assertEquals(1, task.setCount()); |
612 |
assertEquals(0, task.setExceptionCount()); |
613 |
tryToConfuseDoneTask(task); |
614 |
checkCompletedNormally(task, two); |
615 |
awaitTermination(t1); |
616 |
awaitTermination(t2); |
617 |
} |
618 |
|
619 |
/** |
620 |
* Cancelling a task causes timed get in another thread to throw |
621 |
* CancellationException |
622 |
*/ |
623 |
public void testTimedGet_Cancellation() { |
624 |
testTimedGet_Cancellation(false); |
625 |
} |
626 |
public void testTimedGet_Cancellation_interrupt() { |
627 |
testTimedGet_Cancellation(true); |
628 |
} |
629 |
public void testTimedGet_Cancellation(final boolean mayInterruptIfRunning) { |
630 |
final CountDownLatch pleaseCancel = new CountDownLatch(3); |
631 |
final CountDownLatch cancelled = new CountDownLatch(1); |
632 |
final Callable<Object> callable = new CheckedCallable<>() { |
633 |
public Object realCall() throws InterruptedException { |
634 |
pleaseCancel.countDown(); |
635 |
if (mayInterruptIfRunning) { |
636 |
try { |
637 |
delay(2*LONG_DELAY_MS); |
638 |
} catch (InterruptedException success) {} |
639 |
} else { |
640 |
await(cancelled); |
641 |
} |
642 |
return two; |
643 |
}}; |
644 |
final PublicFutureTask task = new PublicFutureTask(callable); |
645 |
|
646 |
Thread t1 = new ThreadShouldThrow(CancellationException.class) { |
647 |
public void realRun() throws Exception { |
648 |
pleaseCancel.countDown(); |
649 |
task.get(); |
650 |
}}; |
651 |
Thread t2 = new ThreadShouldThrow(CancellationException.class) { |
652 |
public void realRun() throws Exception { |
653 |
pleaseCancel.countDown(); |
654 |
task.get(2*LONG_DELAY_MS, MILLISECONDS); |
655 |
}}; |
656 |
t1.start(); |
657 |
t2.start(); |
658 |
Thread t3 = newStartedThread(task); |
659 |
await(pleaseCancel); |
660 |
checkIsRunning(task); |
661 |
task.cancel(mayInterruptIfRunning); |
662 |
checkCancelled(task); |
663 |
awaitTermination(t1); |
664 |
awaitTermination(t2); |
665 |
cancelled.countDown(); |
666 |
awaitTermination(t3); |
667 |
assertEquals(1, task.runCount()); |
668 |
assertEquals(1, task.setCount()); |
669 |
assertEquals(0, task.setExceptionCount()); |
670 |
tryToConfuseDoneTask(task); |
671 |
checkCancelled(task); |
672 |
} |
673 |
|
674 |
/** |
675 |
* A runtime exception in task causes get to throw ExecutionException |
676 |
*/ |
677 |
public void testGet_ExecutionException() throws InterruptedException { |
678 |
final ArithmeticException e = new ArithmeticException(); |
679 |
final PublicFutureTask task = new PublicFutureTask(new Callable<Object>() { |
680 |
public Object call() { |
681 |
throw e; |
682 |
}}); |
683 |
|
684 |
task.run(); |
685 |
assertEquals(1, task.runCount()); |
686 |
assertEquals(0, task.setCount()); |
687 |
assertEquals(1, task.setExceptionCount()); |
688 |
try { |
689 |
task.get(); |
690 |
shouldThrow(); |
691 |
} catch (ExecutionException success) { |
692 |
assertSame(e, success.getCause()); |
693 |
tryToConfuseDoneTask(task); |
694 |
checkCompletedAbnormally(task, success.getCause()); |
695 |
} |
696 |
} |
697 |
|
698 |
/** |
699 |
* A runtime exception in task causes timed get to throw ExecutionException |
700 |
*/ |
701 |
public void testTimedGet_ExecutionException2() throws Exception { |
702 |
final ArithmeticException e = new ArithmeticException(); |
703 |
final PublicFutureTask task = new PublicFutureTask(new Callable<Object>() { |
704 |
public Object call() { |
705 |
throw e; |
706 |
}}); |
707 |
|
708 |
task.run(); |
709 |
try { |
710 |
task.get(LONG_DELAY_MS, MILLISECONDS); |
711 |
shouldThrow(); |
712 |
} catch (ExecutionException success) { |
713 |
assertSame(e, success.getCause()); |
714 |
tryToConfuseDoneTask(task); |
715 |
checkCompletedAbnormally(task, success.getCause()); |
716 |
} |
717 |
} |
718 |
|
719 |
/** |
720 |
* get is interruptible |
721 |
*/ |
722 |
public void testGet_Interruptible() { |
723 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
724 |
final FutureTask<Object> task = new FutureTask<>(new NoOpCallable()); |
725 |
Thread t = newStartedThread(new CheckedRunnable() { |
726 |
public void realRun() throws Exception { |
727 |
Thread.currentThread().interrupt(); |
728 |
try { |
729 |
task.get(); |
730 |
shouldThrow(); |
731 |
} catch (InterruptedException success) {} |
732 |
assertFalse(Thread.interrupted()); |
733 |
|
734 |
pleaseInterrupt.countDown(); |
735 |
try { |
736 |
task.get(); |
737 |
shouldThrow(); |
738 |
} catch (InterruptedException success) {} |
739 |
assertFalse(Thread.interrupted()); |
740 |
}}); |
741 |
|
742 |
await(pleaseInterrupt); |
743 |
t.interrupt(); |
744 |
awaitTermination(t); |
745 |
checkNotDone(task); |
746 |
} |
747 |
|
748 |
/** |
749 |
* timed get is interruptible |
750 |
*/ |
751 |
public void testTimedGet_Interruptible() { |
752 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
753 |
final FutureTask<Object> task = new FutureTask<>(new NoOpCallable()); |
754 |
Thread t = newStartedThread(new CheckedRunnable() { |
755 |
public void realRun() throws Exception { |
756 |
Thread.currentThread().interrupt(); |
757 |
try { |
758 |
task.get(randomTimeout(), randomTimeUnit()); |
759 |
shouldThrow(); |
760 |
} catch (InterruptedException success) {} |
761 |
assertFalse(Thread.interrupted()); |
762 |
|
763 |
pleaseInterrupt.countDown(); |
764 |
try { |
765 |
task.get(LONGER_DELAY_MS, MILLISECONDS); |
766 |
shouldThrow(); |
767 |
} catch (InterruptedException success) {} |
768 |
assertFalse(Thread.interrupted()); |
769 |
}}); |
770 |
|
771 |
await(pleaseInterrupt); |
772 |
if (randomBoolean()) assertThreadBlocks(t, Thread.State.TIMED_WAITING); |
773 |
t.interrupt(); |
774 |
awaitTermination(t); |
775 |
checkNotDone(task); |
776 |
} |
777 |
|
778 |
/** |
779 |
* A timed out timed get throws TimeoutException |
780 |
*/ |
781 |
public void testGet_TimeoutException() throws Exception { |
782 |
FutureTask<Object> task = new FutureTask<>(new NoOpCallable()); |
783 |
long startTime = System.nanoTime(); |
784 |
try { |
785 |
task.get(timeoutMillis(), MILLISECONDS); |
786 |
shouldThrow(); |
787 |
} catch (TimeoutException success) { |
788 |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
789 |
} |
790 |
} |
791 |
|
792 |
/** |
793 |
* timed get with null TimeUnit throws NullPointerException |
794 |
*/ |
795 |
public void testGet_NullTimeUnit() throws Exception { |
796 |
FutureTask<Object> task = new FutureTask<>(new NoOpCallable()); |
797 |
long[] timeouts = { Long.MIN_VALUE, 0L, Long.MAX_VALUE }; |
798 |
|
799 |
for (long timeout : timeouts) { |
800 |
try { |
801 |
task.get(timeout, null); |
802 |
shouldThrow(); |
803 |
} catch (NullPointerException success) {} |
804 |
} |
805 |
|
806 |
task.run(); |
807 |
|
808 |
for (long timeout : timeouts) { |
809 |
try { |
810 |
task.get(timeout, null); |
811 |
shouldThrow(); |
812 |
} catch (NullPointerException success) {} |
813 |
} |
814 |
} |
815 |
|
816 |
/** |
817 |
* timed get with most negative timeout works correctly (i.e. no |
818 |
* underflow bug) |
819 |
*/ |
820 |
public void testGet_NegativeInfinityTimeout() throws Exception { |
821 |
final ExecutorService pool = Executors.newFixedThreadPool(10); |
822 |
final Runnable nop = new Runnable() { public void run() {}}; |
823 |
final FutureTask<Void> task = new FutureTask<>(nop, null); |
824 |
final List<Future<?>> futures = new ArrayList<>(); |
825 |
Runnable r = new Runnable() { public void run() { |
826 |
for (long timeout : new long[] { 0L, -1L, Long.MIN_VALUE }) { |
827 |
try { |
828 |
task.get(timeout, NANOSECONDS); |
829 |
shouldThrow(); |
830 |
} catch (TimeoutException success) { |
831 |
} catch (Throwable fail) {threadUnexpectedException(fail);}}}}; |
832 |
for (int i = 0; i < 10; i++) |
833 |
futures.add(pool.submit(r)); |
834 |
try { |
835 |
joinPool(pool); |
836 |
for (Future<?> future : futures) |
837 |
checkCompletedNormally(future, null); |
838 |
} finally { |
839 |
task.run(); // last resort to help terminate |
840 |
} |
841 |
} |
842 |
|
843 |
/** |
844 |
* toString indicates current completion state |
845 |
*/ |
846 |
public void testToString_incomplete() { |
847 |
FutureTask<String> f = new FutureTask<>(() -> ""); |
848 |
assertTrue(f.toString().matches(".*\\[.*Not completed.*\\]")); |
849 |
if (testImplementationDetails) |
850 |
assertTrue(f.toString().startsWith( |
851 |
identityString(f) + "[Not completed, task =")); |
852 |
} |
853 |
|
854 |
public void testToString_normal() { |
855 |
FutureTask<String> f = new FutureTask<>(() -> ""); |
856 |
f.run(); |
857 |
assertTrue(f.toString().matches(".*\\[.*Completed normally.*\\]")); |
858 |
if (testImplementationDetails) |
859 |
assertEquals(identityString(f) + "[Completed normally]", |
860 |
f.toString()); |
861 |
} |
862 |
|
863 |
public void testToString_exception() { |
864 |
FutureTask<String> f = new FutureTask<>( |
865 |
() -> { throw new ArithmeticException(); }); |
866 |
f.run(); |
867 |
assertTrue(f.toString().matches(".*\\[.*Completed exceptionally.*\\]")); |
868 |
if (testImplementationDetails) |
869 |
assertTrue(f.toString().startsWith( |
870 |
identityString(f) + "[Completed exceptionally: ")); |
871 |
} |
872 |
|
873 |
public void testToString_cancelled() { |
874 |
for (boolean mayInterruptIfRunning : new boolean[] { true, false }) { |
875 |
FutureTask<String> f = new FutureTask<>(() -> ""); |
876 |
assertTrue(f.cancel(mayInterruptIfRunning)); |
877 |
assertTrue(f.toString().matches(".*\\[.*Cancelled.*\\]")); |
878 |
if (testImplementationDetails) |
879 |
assertEquals(identityString(f) + "[Cancelled]", |
880 |
f.toString()); |
881 |
} |
882 |
} |
883 |
|
884 |
} |