| 1 |
/* |
| 2 |
* Written by Doug Lea and Martin Buchholz with assistance from members |
| 3 |
* of JCP JSR-166 Expert Group and released to the public domain, as |
| 4 |
* explained at http://creativecommons.org/publicdomain/zero/1.0/ |
| 5 |
* |
| 6 |
* Other contributors include Andrew Wright, Jeffrey Hayes, |
| 7 |
* Pat Fisher, Mike Judd. |
| 8 |
*/ |
| 9 |
|
| 10 |
import junit.framework.*; |
| 11 |
import java.util.*; |
| 12 |
import java.util.concurrent.*; |
| 13 |
import static java.util.concurrent.TimeUnit.MILLISECONDS; |
| 14 |
|
| 15 |
/** |
| 16 |
* Contains tests generally applicable to BlockingQueue implementations. |
| 17 |
*/ |
| 18 |
public abstract class BlockingQueueTest extends JSR166TestCase { |
| 19 |
/* |
| 20 |
* This is the start of an attempt to refactor the tests for the |
| 21 |
* various related implementations of related interfaces without |
| 22 |
* too much duplicated code. junit does not really support such |
| 23 |
* testing. Here subclasses of TestCase not only contain tests, |
| 24 |
* but also configuration information that describes the |
| 25 |
* implementation class, most importantly how to instantiate |
| 26 |
* instances. |
| 27 |
*/ |
| 28 |
|
| 29 |
/** Like suite(), but non-static */ |
| 30 |
public Test testSuite() { |
| 31 |
// TODO: filter the returned tests using the configuration |
| 32 |
// information provided by the subclass via protected methods. |
| 33 |
return new TestSuite(this.getClass()); |
| 34 |
} |
| 35 |
|
| 36 |
/** Returns an empty instance of the implementation class. */ |
| 37 |
protected abstract BlockingQueue emptyCollection(); |
| 38 |
|
| 39 |
/** |
| 40 |
* timed poll before a delayed offer fails; after offer succeeds; |
| 41 |
* on interruption throws |
| 42 |
*/ |
| 43 |
public void testTimedPollWithOffer() throws InterruptedException { |
| 44 |
final BlockingQueue q = emptyCollection(); |
| 45 |
final CheckedBarrier barrier = new CheckedBarrier(2); |
| 46 |
Thread t = newStartedThread(new CheckedRunnable() { |
| 47 |
public void realRun() throws InterruptedException { |
| 48 |
assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS)); |
| 49 |
|
| 50 |
barrier.await(); |
| 51 |
assertSame(zero, q.poll(MEDIUM_DELAY_MS, MILLISECONDS)); |
| 52 |
|
| 53 |
Thread.currentThread().interrupt(); |
| 54 |
try { |
| 55 |
q.poll(SHORT_DELAY_MS, MILLISECONDS); |
| 56 |
shouldThrow(); |
| 57 |
} catch (InterruptedException success) {} |
| 58 |
|
| 59 |
barrier.await(); |
| 60 |
try { |
| 61 |
q.poll(MEDIUM_DELAY_MS, MILLISECONDS); |
| 62 |
shouldThrow(); |
| 63 |
} catch (InterruptedException success) {} |
| 64 |
}}); |
| 65 |
|
| 66 |
barrier.await(); |
| 67 |
assertTrue(q.offer(zero, SHORT_DELAY_MS, MILLISECONDS)); |
| 68 |
barrier.await(); |
| 69 |
sleep(SHORT_DELAY_MS); |
| 70 |
t.interrupt(); |
| 71 |
awaitTermination(t, MEDIUM_DELAY_MS); |
| 72 |
} |
| 73 |
|
| 74 |
/** |
| 75 |
* take() blocks interruptibly when empty |
| 76 |
*/ |
| 77 |
public void testTakeFromEmptyBlocksInterruptibly() |
| 78 |
throws InterruptedException { |
| 79 |
final BlockingQueue q = emptyCollection(); |
| 80 |
final CountDownLatch threadStarted = new CountDownLatch(1); |
| 81 |
Thread t = newStartedThread(new CheckedRunnable() { |
| 82 |
public void realRun() { |
| 83 |
long t0 = System.nanoTime(); |
| 84 |
threadStarted.countDown(); |
| 85 |
try { |
| 86 |
q.take(); |
| 87 |
shouldThrow(); |
| 88 |
} catch (InterruptedException success) {} |
| 89 |
assertTrue(millisElapsedSince(t0) >= SHORT_DELAY_MS); |
| 90 |
}}); |
| 91 |
|
| 92 |
threadStarted.await(); |
| 93 |
delay(SHORT_DELAY_MS); |
| 94 |
assertTrue(t.isAlive()); |
| 95 |
t.interrupt(); |
| 96 |
awaitTermination(t, MEDIUM_DELAY_MS); |
| 97 |
} |
| 98 |
|
| 99 |
/** |
| 100 |
* take() throws InterruptedException immediately if interrupted |
| 101 |
* before waiting |
| 102 |
*/ |
| 103 |
public void testTakeFromEmptyAfterInterrupt() |
| 104 |
throws InterruptedException { |
| 105 |
final BlockingQueue q = emptyCollection(); |
| 106 |
Thread t = newStartedThread(new CheckedRunnable() { |
| 107 |
public void realRun() { |
| 108 |
long t0 = System.nanoTime(); |
| 109 |
Thread.currentThread().interrupt(); |
| 110 |
try { |
| 111 |
q.take(); |
| 112 |
shouldThrow(); |
| 113 |
} catch (InterruptedException success) {} |
| 114 |
assertTrue(millisElapsedSince(t0) < SMALL_DELAY_MS); |
| 115 |
}}); |
| 116 |
|
| 117 |
awaitTermination(t, MEDIUM_DELAY_MS); |
| 118 |
} |
| 119 |
|
| 120 |
/** For debugging. */ |
| 121 |
public void XXXXtestFails() { |
| 122 |
fail(emptyCollection().getClass().toString()); |
| 123 |
} |
| 124 |
|
| 125 |
} |
