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/* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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* Other contributors include Andrew Wright, Jeffrey Hayes, |
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* Pat Fisher, Mike Judd. |
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*/ |
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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 |
|
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public class FutureTaskTest extends JSR166TestCase { |
30 |
|
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public static void main(String[] args) { |
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main(suite(), args); |
33 |
} |
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public static Test suite() { |
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return new TestSuite(FutureTaskTest.class); |
36 |
} |
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|
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void checkIsDone(Future<?> f) { |
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assertTrue(f.isDone()); |
40 |
assertFalse(f.cancel(false)); |
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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()); |
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Object r = null; Object exInfo = null; |
48 |
try { |
49 |
r = f.get(); |
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} catch (CancellationException t) { |
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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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try { |
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assertSame(r, f.get()); |
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} catch (CancellationException t) { |
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assertSame(exInfo, CancellationException.class); |
67 |
} catch (ExecutionException t) { |
68 |
assertSame(exInfo, t.getCause()); |
69 |
} catch (Throwable t) { |
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threadUnexpectedException(t); |
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} |
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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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|
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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()); |
99 |
} |
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checkNotDone(f); |
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} |
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} |
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|
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<T> void checkCompletedNormally(Future<T> f, T expected) { |
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checkIsDone(f); |
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assertFalse(f.isCancelled()); |
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|
108 |
try { |
109 |
assertSame(expected, f.get()); |
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assertSame(expected, f.get(randomTimeout(), randomTimeUnit())); |
111 |
} catch (Throwable fail) { threadUnexpectedException(fail); } |
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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); } |
129 |
} |
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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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|
150 |
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); } |
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} |
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|
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/** |
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* Subclass to expose protected methods |
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*/ |
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static class PublicFutureTask extends FutureTask { |
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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) { |
177 |
this(runnable, result, new AtomicInteger(0)); |
178 |
} |
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private PublicFutureTask(final Runnable runnable, Object result, |
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final AtomicInteger runCount) { |
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super(new Runnable() { |
182 |
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)); |
190 |
} |
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private PublicFutureTask(final Callable callable, |
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final AtomicInteger runCount) { |
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super(new Callable() { |
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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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} |
209 |
@Override public void set(Object x) { |
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setCount.incrementAndGet(); |
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super.set(x); |
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} |
213 |
@Override public void setException(Throwable t) { |
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setExceptionCount.incrementAndGet(); |
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super.setException(t); |
216 |
} |
217 |
} |
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|
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class Counter extends CheckedRunnable { |
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final AtomicInteger count = new AtomicInteger(0); |
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public int get() { return count.get(); } |
222 |
public void realRun() { |
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count.getAndIncrement(); |
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} |
225 |
} |
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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() { |
231 |
try { |
232 |
new FutureTask(null); |
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shouldThrow(); |
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} catch (NullPointerException success) {} |
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} |
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|
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/** |
238 |
* creating a future with null runnable throws NullPointerException |
239 |
*/ |
240 |
public void testConstructor2() { |
241 |
try { |
242 |
new FutureTask(null, Boolean.TRUE); |
243 |
shouldThrow(); |
244 |
} catch (NullPointerException success) {} |
245 |
} |
246 |
|
247 |
/** |
248 |
* isDone is true when a task completes |
249 |
*/ |
250 |
public void testIsDone() { |
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PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
252 |
assertFalse(task.isDone()); |
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task.run(); |
254 |
assertTrue(task.isDone()); |
255 |
checkCompletedNormally(task, Boolean.TRUE); |
256 |
assertEquals(1, task.runCount()); |
257 |
} |
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|
259 |
/** |
260 |
* runAndReset of a non-cancelled task succeeds |
261 |
*/ |
262 |
public void testRunAndReset() { |
263 |
PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
264 |
for (int i = 0; i < 3; i++) { |
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assertTrue(task.runAndReset()); |
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checkNotDone(task); |
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assertEquals(i + 1, task.runCount()); |
268 |
assertEquals(i + 1, task.runAndResetCount()); |
269 |
assertEquals(0, task.setCount()); |
270 |
assertEquals(0, task.setExceptionCount()); |
271 |
} |
272 |
} |
273 |
|
274 |
/** |
275 |
* runAndReset after cancellation fails |
276 |
*/ |
277 |
public void testRunAndResetAfterCancel() { |
278 |
for (boolean mayInterruptIfRunning : new boolean[] { true, false }) { |
279 |
PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
280 |
assertTrue(task.cancel(mayInterruptIfRunning)); |
281 |
for (int i = 0; i < 3; i++) { |
282 |
assertFalse(task.runAndReset()); |
283 |
assertEquals(0, task.runCount()); |
284 |
assertEquals(i + 1, task.runAndResetCount()); |
285 |
assertEquals(0, task.setCount()); |
286 |
assertEquals(0, task.setExceptionCount()); |
287 |
} |
288 |
tryToConfuseDoneTask(task); |
289 |
checkCancelled(task); |
290 |
} |
291 |
} |
292 |
|
293 |
/** |
294 |
* setting value causes get to return it |
295 |
*/ |
296 |
public void testSet() throws Exception { |
297 |
PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
298 |
task.set(one); |
299 |
for (int i = 0; i < 3; i++) { |
300 |
assertSame(one, task.get()); |
301 |
assertSame(one, task.get(LONG_DELAY_MS, MILLISECONDS)); |
302 |
assertEquals(1, task.setCount()); |
303 |
} |
304 |
tryToConfuseDoneTask(task); |
305 |
checkCompletedNormally(task, one); |
306 |
assertEquals(0, task.runCount()); |
307 |
} |
308 |
|
309 |
/** |
310 |
* setException causes get to throw ExecutionException |
311 |
*/ |
312 |
public void testSetException_get() throws Exception { |
313 |
Exception nse = new NoSuchElementException(); |
314 |
PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
315 |
task.setException(nse); |
316 |
|
317 |
try { |
318 |
task.get(); |
319 |
shouldThrow(); |
320 |
} catch (ExecutionException success) { |
321 |
assertSame(nse, success.getCause()); |
322 |
checkCompletedAbnormally(task, nse); |
323 |
} |
324 |
|
325 |
try { |
326 |
task.get(LONG_DELAY_MS, MILLISECONDS); |
327 |
shouldThrow(); |
328 |
} catch (ExecutionException success) { |
329 |
assertSame(nse, success.getCause()); |
330 |
checkCompletedAbnormally(task, nse); |
331 |
} |
332 |
|
333 |
assertEquals(1, task.setExceptionCount()); |
334 |
assertEquals(0, task.setCount()); |
335 |
tryToConfuseDoneTask(task); |
336 |
checkCompletedAbnormally(task, nse); |
337 |
assertEquals(0, task.runCount()); |
338 |
} |
339 |
|
340 |
/** |
341 |
* cancel(false) before run succeeds |
342 |
*/ |
343 |
public void testCancelBeforeRun() { |
344 |
PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
345 |
assertTrue(task.cancel(false)); |
346 |
task.run(); |
347 |
assertEquals(0, task.runCount()); |
348 |
assertEquals(0, task.setCount()); |
349 |
assertEquals(0, task.setExceptionCount()); |
350 |
assertTrue(task.isCancelled()); |
351 |
assertTrue(task.isDone()); |
352 |
tryToConfuseDoneTask(task); |
353 |
assertEquals(0, task.runCount()); |
354 |
checkCancelled(task); |
355 |
} |
356 |
|
357 |
/** |
358 |
* cancel(true) before run succeeds |
359 |
*/ |
360 |
public void testCancelBeforeRun2() { |
361 |
PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
362 |
assertTrue(task.cancel(true)); |
363 |
task.run(); |
364 |
assertEquals(0, task.runCount()); |
365 |
assertEquals(0, task.setCount()); |
366 |
assertEquals(0, task.setExceptionCount()); |
367 |
assertTrue(task.isCancelled()); |
368 |
assertTrue(task.isDone()); |
369 |
tryToConfuseDoneTask(task); |
370 |
assertEquals(0, task.runCount()); |
371 |
checkCancelled(task); |
372 |
} |
373 |
|
374 |
/** |
375 |
* cancel(false) of a completed task fails |
376 |
*/ |
377 |
public void testCancelAfterRun() { |
378 |
PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
379 |
task.run(); |
380 |
assertFalse(task.cancel(false)); |
381 |
assertEquals(1, task.runCount()); |
382 |
assertEquals(1, task.setCount()); |
383 |
assertEquals(0, task.setExceptionCount()); |
384 |
tryToConfuseDoneTask(task); |
385 |
checkCompletedNormally(task, Boolean.TRUE); |
386 |
assertEquals(1, task.runCount()); |
387 |
} |
388 |
|
389 |
/** |
390 |
* cancel(true) of a completed task fails |
391 |
*/ |
392 |
public void testCancelAfterRun2() { |
393 |
PublicFutureTask task = new PublicFutureTask(new NoOpCallable()); |
394 |
task.run(); |
395 |
assertFalse(task.cancel(true)); |
396 |
assertEquals(1, task.runCount()); |
397 |
assertEquals(1, task.setCount()); |
398 |
assertEquals(0, task.setExceptionCount()); |
399 |
tryToConfuseDoneTask(task); |
400 |
checkCompletedNormally(task, Boolean.TRUE); |
401 |
assertEquals(1, task.runCount()); |
402 |
} |
403 |
|
404 |
/** |
405 |
* cancel(true) interrupts a running task that subsequently succeeds |
406 |
*/ |
407 |
public void testCancelInterrupt() { |
408 |
final CountDownLatch pleaseCancel = new CountDownLatch(1); |
409 |
final PublicFutureTask task = |
410 |
new PublicFutureTask(new CheckedRunnable() { |
411 |
public void realRun() { |
412 |
pleaseCancel.countDown(); |
413 |
try { |
414 |
delay(LONG_DELAY_MS); |
415 |
shouldThrow(); |
416 |
} catch (InterruptedException success) {} |
417 |
assertFalse(Thread.interrupted()); |
418 |
}}); |
419 |
|
420 |
Thread t = newStartedThread(task); |
421 |
await(pleaseCancel); |
422 |
assertTrue(task.cancel(true)); |
423 |
assertTrue(task.isCancelled()); |
424 |
assertTrue(task.isDone()); |
425 |
awaitTermination(t); |
426 |
assertEquals(1, task.runCount()); |
427 |
assertEquals(1, task.setCount()); |
428 |
assertEquals(0, task.setExceptionCount()); |
429 |
tryToConfuseDoneTask(task); |
430 |
checkCancelled(task); |
431 |
} |
432 |
|
433 |
/** |
434 |
* cancel(true) tries to interrupt a running task, but |
435 |
* Thread.interrupt throws (simulating a restrictive security |
436 |
* manager) |
437 |
*/ |
438 |
public void testCancelInterrupt_ThrowsSecurityException() { |
439 |
final CountDownLatch pleaseCancel = new CountDownLatch(1); |
440 |
final CountDownLatch cancelled = new CountDownLatch(1); |
441 |
final PublicFutureTask task = |
442 |
new PublicFutureTask(new CheckedRunnable() { |
443 |
public void realRun() { |
444 |
pleaseCancel.countDown(); |
445 |
await(cancelled); |
446 |
assertFalse(Thread.interrupted()); |
447 |
}}); |
448 |
|
449 |
final Thread t = new Thread(task) { |
450 |
// Simulate a restrictive security manager. |
451 |
@Override public void interrupt() { |
452 |
throw new SecurityException(); |
453 |
}}; |
454 |
t.setDaemon(true); |
455 |
t.start(); |
456 |
|
457 |
await(pleaseCancel); |
458 |
try { |
459 |
task.cancel(true); |
460 |
shouldThrow(); |
461 |
} catch (SecurityException expected) {} |
462 |
|
463 |
// We failed to deliver the interrupt, but the world retains |
464 |
// its sanity, as if we had done task.cancel(false) |
465 |
assertTrue(task.isCancelled()); |
466 |
assertTrue(task.isDone()); |
467 |
assertEquals(1, task.runCount()); |
468 |
assertEquals(1, task.doneCount()); |
469 |
assertEquals(0, task.setCount()); |
470 |
assertEquals(0, task.setExceptionCount()); |
471 |
cancelled.countDown(); |
472 |
awaitTermination(t); |
473 |
assertEquals(1, task.setCount()); |
474 |
assertEquals(0, task.setExceptionCount()); |
475 |
tryToConfuseDoneTask(task); |
476 |
checkCancelled(task); |
477 |
} |
478 |
|
479 |
/** |
480 |
* cancel(true) interrupts a running task that subsequently throws |
481 |
*/ |
482 |
public void testCancelInterrupt_taskFails() { |
483 |
final CountDownLatch pleaseCancel = new CountDownLatch(1); |
484 |
final PublicFutureTask task = |
485 |
new PublicFutureTask(new Runnable() { |
486 |
public void run() { |
487 |
pleaseCancel.countDown(); |
488 |
try { |
489 |
delay(LONG_DELAY_MS); |
490 |
threadShouldThrow(); |
491 |
} catch (InterruptedException success) { |
492 |
} catch (Throwable t) { threadUnexpectedException(t); } |
493 |
throw new RuntimeException(); |
494 |
}}); |
495 |
|
496 |
Thread t = newStartedThread(task); |
497 |
await(pleaseCancel); |
498 |
assertTrue(task.cancel(true)); |
499 |
assertTrue(task.isCancelled()); |
500 |
awaitTermination(t); |
501 |
assertEquals(1, task.runCount()); |
502 |
assertEquals(0, task.setCount()); |
503 |
assertEquals(1, task.setExceptionCount()); |
504 |
tryToConfuseDoneTask(task); |
505 |
checkCancelled(task); |
506 |
} |
507 |
|
508 |
/** |
509 |
* cancel(false) does not interrupt a running task |
510 |
*/ |
511 |
public void testCancelNoInterrupt() { |
512 |
final CountDownLatch pleaseCancel = new CountDownLatch(1); |
513 |
final CountDownLatch cancelled = new CountDownLatch(1); |
514 |
final PublicFutureTask task = |
515 |
new PublicFutureTask(new CheckedCallable<Boolean>() { |
516 |
public Boolean realCall() { |
517 |
pleaseCancel.countDown(); |
518 |
await(cancelled); |
519 |
assertFalse(Thread.interrupted()); |
520 |
return Boolean.TRUE; |
521 |
}}); |
522 |
|
523 |
Thread t = newStartedThread(task); |
524 |
await(pleaseCancel); |
525 |
assertTrue(task.cancel(false)); |
526 |
assertTrue(task.isCancelled()); |
527 |
cancelled.countDown(); |
528 |
awaitTermination(t); |
529 |
assertEquals(1, task.runCount()); |
530 |
assertEquals(1, task.setCount()); |
531 |
assertEquals(0, task.setExceptionCount()); |
532 |
tryToConfuseDoneTask(task); |
533 |
checkCancelled(task); |
534 |
} |
535 |
|
536 |
/** |
537 |
* run in one thread causes get in another thread to retrieve value |
538 |
*/ |
539 |
public void testGetRun() { |
540 |
final CountDownLatch pleaseRun = new CountDownLatch(2); |
541 |
|
542 |
final PublicFutureTask task = |
543 |
new PublicFutureTask(new CheckedCallable<Object>() { |
544 |
public Object realCall() { |
545 |
return two; |
546 |
}}); |
547 |
|
548 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
549 |
public void realRun() throws Exception { |
550 |
pleaseRun.countDown(); |
551 |
assertSame(two, task.get()); |
552 |
}}); |
553 |
|
554 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
555 |
public void realRun() throws Exception { |
556 |
pleaseRun.countDown(); |
557 |
assertSame(two, task.get(2*LONG_DELAY_MS, MILLISECONDS)); |
558 |
}}); |
559 |
|
560 |
await(pleaseRun); |
561 |
checkNotDone(task); |
562 |
assertTrue(t1.isAlive()); |
563 |
assertTrue(t2.isAlive()); |
564 |
task.run(); |
565 |
checkCompletedNormally(task, two); |
566 |
assertEquals(1, task.runCount()); |
567 |
assertEquals(1, task.setCount()); |
568 |
assertEquals(0, task.setExceptionCount()); |
569 |
awaitTermination(t1); |
570 |
awaitTermination(t2); |
571 |
tryToConfuseDoneTask(task); |
572 |
checkCompletedNormally(task, two); |
573 |
} |
574 |
|
575 |
/** |
576 |
* set in one thread causes get in another thread to retrieve value |
577 |
*/ |
578 |
public void testGetSet() { |
579 |
final CountDownLatch pleaseSet = new CountDownLatch(2); |
580 |
|
581 |
final PublicFutureTask task = |
582 |
new PublicFutureTask(new CheckedCallable<Object>() { |
583 |
public Object realCall() throws InterruptedException { |
584 |
return two; |
585 |
}}); |
586 |
|
587 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
588 |
public void realRun() throws Exception { |
589 |
pleaseSet.countDown(); |
590 |
assertSame(two, task.get()); |
591 |
}}); |
592 |
|
593 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
594 |
public void realRun() throws Exception { |
595 |
pleaseSet.countDown(); |
596 |
assertSame(two, task.get(2*LONG_DELAY_MS, MILLISECONDS)); |
597 |
}}); |
598 |
|
599 |
await(pleaseSet); |
600 |
checkNotDone(task); |
601 |
assertTrue(t1.isAlive()); |
602 |
assertTrue(t2.isAlive()); |
603 |
task.set(two); |
604 |
assertEquals(0, task.runCount()); |
605 |
assertEquals(1, task.setCount()); |
606 |
assertEquals(0, task.setExceptionCount()); |
607 |
tryToConfuseDoneTask(task); |
608 |
checkCompletedNormally(task, two); |
609 |
awaitTermination(t1); |
610 |
awaitTermination(t2); |
611 |
} |
612 |
|
613 |
/** |
614 |
* Cancelling a task causes timed get in another thread to throw |
615 |
* CancellationException |
616 |
*/ |
617 |
public void testTimedGet_Cancellation() { |
618 |
testTimedGet_Cancellation(false); |
619 |
} |
620 |
public void testTimedGet_Cancellation_interrupt() { |
621 |
testTimedGet_Cancellation(true); |
622 |
} |
623 |
public void testTimedGet_Cancellation(final boolean mayInterruptIfRunning) { |
624 |
final CountDownLatch pleaseCancel = new CountDownLatch(3); |
625 |
final CountDownLatch cancelled = new CountDownLatch(1); |
626 |
final Callable<Object> callable = |
627 |
new CheckedCallable<Object>() { |
628 |
public Object realCall() throws InterruptedException { |
629 |
pleaseCancel.countDown(); |
630 |
if (mayInterruptIfRunning) { |
631 |
try { |
632 |
delay(2*LONG_DELAY_MS); |
633 |
} catch (InterruptedException success) {} |
634 |
} else { |
635 |
await(cancelled); |
636 |
} |
637 |
return two; |
638 |
}}; |
639 |
final PublicFutureTask task = new PublicFutureTask(callable); |
640 |
|
641 |
Thread t1 = new ThreadShouldThrow(CancellationException.class) { |
642 |
public void realRun() throws Exception { |
643 |
pleaseCancel.countDown(); |
644 |
task.get(); |
645 |
}}; |
646 |
Thread t2 = new ThreadShouldThrow(CancellationException.class) { |
647 |
public void realRun() throws Exception { |
648 |
pleaseCancel.countDown(); |
649 |
task.get(2*LONG_DELAY_MS, MILLISECONDS); |
650 |
}}; |
651 |
t1.start(); |
652 |
t2.start(); |
653 |
Thread t3 = newStartedThread(task); |
654 |
await(pleaseCancel); |
655 |
checkIsRunning(task); |
656 |
task.cancel(mayInterruptIfRunning); |
657 |
checkCancelled(task); |
658 |
awaitTermination(t1); |
659 |
awaitTermination(t2); |
660 |
cancelled.countDown(); |
661 |
awaitTermination(t3); |
662 |
assertEquals(1, task.runCount()); |
663 |
assertEquals(1, task.setCount()); |
664 |
assertEquals(0, task.setExceptionCount()); |
665 |
tryToConfuseDoneTask(task); |
666 |
checkCancelled(task); |
667 |
} |
668 |
|
669 |
/** |
670 |
* A runtime exception in task causes get to throw ExecutionException |
671 |
*/ |
672 |
public void testGet_ExecutionException() throws InterruptedException { |
673 |
final ArithmeticException e = new ArithmeticException(); |
674 |
final PublicFutureTask task = new PublicFutureTask(new Callable() { |
675 |
public Object call() { |
676 |
throw e; |
677 |
}}); |
678 |
|
679 |
task.run(); |
680 |
assertEquals(1, task.runCount()); |
681 |
assertEquals(0, task.setCount()); |
682 |
assertEquals(1, task.setExceptionCount()); |
683 |
try { |
684 |
task.get(); |
685 |
shouldThrow(); |
686 |
} catch (ExecutionException success) { |
687 |
assertSame(e, success.getCause()); |
688 |
tryToConfuseDoneTask(task); |
689 |
checkCompletedAbnormally(task, success.getCause()); |
690 |
} |
691 |
} |
692 |
|
693 |
/** |
694 |
* A runtime exception in task causes timed get to throw ExecutionException |
695 |
*/ |
696 |
public void testTimedGet_ExecutionException2() throws Exception { |
697 |
final ArithmeticException e = new ArithmeticException(); |
698 |
final PublicFutureTask task = new PublicFutureTask(new Callable() { |
699 |
public Object call() { |
700 |
throw e; |
701 |
}}); |
702 |
|
703 |
task.run(); |
704 |
try { |
705 |
task.get(LONG_DELAY_MS, MILLISECONDS); |
706 |
shouldThrow(); |
707 |
} catch (ExecutionException success) { |
708 |
assertSame(e, success.getCause()); |
709 |
tryToConfuseDoneTask(task); |
710 |
checkCompletedAbnormally(task, success.getCause()); |
711 |
} |
712 |
} |
713 |
|
714 |
/** |
715 |
* get is interruptible |
716 |
*/ |
717 |
public void testGet_interruptible() { |
718 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
719 |
final FutureTask task = new FutureTask(new NoOpCallable()); |
720 |
Thread t = newStartedThread(new CheckedRunnable() { |
721 |
public void realRun() throws Exception { |
722 |
Thread.currentThread().interrupt(); |
723 |
try { |
724 |
task.get(); |
725 |
shouldThrow(); |
726 |
} catch (InterruptedException success) {} |
727 |
assertFalse(Thread.interrupted()); |
728 |
|
729 |
pleaseInterrupt.countDown(); |
730 |
try { |
731 |
task.get(); |
732 |
shouldThrow(); |
733 |
} catch (InterruptedException success) {} |
734 |
assertFalse(Thread.interrupted()); |
735 |
}}); |
736 |
|
737 |
await(pleaseInterrupt); |
738 |
t.interrupt(); |
739 |
awaitTermination(t); |
740 |
checkNotDone(task); |
741 |
} |
742 |
|
743 |
/** |
744 |
* timed get is interruptible |
745 |
*/ |
746 |
public void testTimedGet_interruptible() { |
747 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
748 |
final FutureTask task = new FutureTask(new NoOpCallable()); |
749 |
Thread t = newStartedThread(new CheckedRunnable() { |
750 |
public void realRun() throws Exception { |
751 |
Thread.currentThread().interrupt(); |
752 |
try { |
753 |
task.get(2*LONG_DELAY_MS, MILLISECONDS); |
754 |
shouldThrow(); |
755 |
} catch (InterruptedException success) {} |
756 |
assertFalse(Thread.interrupted()); |
757 |
|
758 |
pleaseInterrupt.countDown(); |
759 |
try { |
760 |
task.get(2*LONG_DELAY_MS, MILLISECONDS); |
761 |
shouldThrow(); |
762 |
} catch (InterruptedException success) {} |
763 |
assertFalse(Thread.interrupted()); |
764 |
}}); |
765 |
|
766 |
await(pleaseInterrupt); |
767 |
t.interrupt(); |
768 |
awaitTermination(t); |
769 |
checkNotDone(task); |
770 |
} |
771 |
|
772 |
/** |
773 |
* A timed out timed get throws TimeoutException |
774 |
*/ |
775 |
public void testGet_TimeoutException() throws Exception { |
776 |
FutureTask task = new FutureTask(new NoOpCallable()); |
777 |
long startTime = System.nanoTime(); |
778 |
try { |
779 |
task.get(timeoutMillis(), MILLISECONDS); |
780 |
shouldThrow(); |
781 |
} catch (TimeoutException success) { |
782 |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
783 |
} |
784 |
} |
785 |
|
786 |
/** |
787 |
* timed get with null TimeUnit throws NullPointerException |
788 |
*/ |
789 |
public void testGet_NullTimeUnit() throws Exception { |
790 |
FutureTask task = new FutureTask(new NoOpCallable()); |
791 |
long[] timeouts = { Long.MIN_VALUE, 0L, Long.MAX_VALUE }; |
792 |
|
793 |
for (long timeout : timeouts) { |
794 |
try { |
795 |
task.get(timeout, null); |
796 |
shouldThrow(); |
797 |
} catch (NullPointerException success) {} |
798 |
} |
799 |
|
800 |
task.run(); |
801 |
|
802 |
for (long timeout : timeouts) { |
803 |
try { |
804 |
task.get(timeout, null); |
805 |
shouldThrow(); |
806 |
} catch (NullPointerException success) {} |
807 |
} |
808 |
} |
809 |
|
810 |
/** |
811 |
* timed get with most negative timeout works correctly (i.e. no |
812 |
* underflow bug) |
813 |
*/ |
814 |
public void testGet_NegativeInfinityTimeout() throws Exception { |
815 |
final ExecutorService pool = Executors.newFixedThreadPool(10); |
816 |
final Runnable nop = new Runnable() { public void run() {}}; |
817 |
final FutureTask<Void> task = new FutureTask<>(nop, null); |
818 |
final List<Future<?>> futures = new ArrayList<>(); |
819 |
Runnable r = new Runnable() { public void run() { |
820 |
for (long timeout : new long[] { 0L, -1L, Long.MIN_VALUE }) { |
821 |
try { |
822 |
task.get(timeout, NANOSECONDS); |
823 |
shouldThrow(); |
824 |
} catch (TimeoutException success) { |
825 |
} catch (Throwable fail) {threadUnexpectedException(fail);}}}}; |
826 |
for (int i = 0; i < 10; i++) |
827 |
futures.add(pool.submit(r)); |
828 |
try { |
829 |
joinPool(pool); |
830 |
for (Future<?> future : futures) |
831 |
checkCompletedNormally(future, null); |
832 |
} finally { |
833 |
task.run(); // last resort to help terminate |
834 |
} |
835 |
} |
836 |
|
837 |
/** |
838 |
* toString indicates current completion state |
839 |
*/ |
840 |
public void testToString_incomplete() { |
841 |
FutureTask<String> f = new FutureTask<String>(() -> ""); |
842 |
assertTrue(f.toString().matches(".*\\[.*Not completed.*\\]")); |
843 |
if (testImplementationDetails) |
844 |
assertTrue(f.toString().startsWith( |
845 |
identityString(f) + "[Not completed, task =")); |
846 |
} |
847 |
|
848 |
public void testToString_normal() { |
849 |
FutureTask<String> f = new FutureTask<String>(() -> ""); |
850 |
f.run(); |
851 |
assertTrue(f.toString().matches(".*\\[.*Completed normally.*\\]")); |
852 |
if (testImplementationDetails) |
853 |
assertEquals(identityString(f) + "[Completed normally]", |
854 |
f.toString()); |
855 |
} |
856 |
|
857 |
public void testToString_exception() { |
858 |
FutureTask<String> f = new FutureTask<String>( |
859 |
() -> { throw new ArithmeticException(); }); |
860 |
f.run(); |
861 |
assertTrue(f.toString().matches(".*\\[.*Completed exceptionally.*\\]")); |
862 |
if (testImplementationDetails) |
863 |
assertTrue(f.toString().startsWith( |
864 |
identityString(f) + "[Completed exceptionally: ")); |
865 |
} |
866 |
|
867 |
public void testToString_cancelled() { |
868 |
for (boolean mayInterruptIfRunning : new boolean[] { true, false }) { |
869 |
FutureTask<String> f = new FutureTask<String>(() -> ""); |
870 |
assertTrue(f.cancel(mayInterruptIfRunning)); |
871 |
assertTrue(f.toString().matches(".*\\[.*Cancelled.*\\]")); |
872 |
if (testImplementationDetails) |
873 |
assertEquals(identityString(f) + "[Cancelled]", |
874 |
f.toString()); |
875 |
} |
876 |
} |
877 |
|
878 |
} |