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root/jsr166/jsr166/src/test/tck/JSR166TestCase.java

Comparing jsr166/src/test/tck/JSR166TestCase.java (file contents):
Revision 1.1 by dl, Sun Sep 14 20:42:40 2003 UTC vs.
Revision 1.29 by dl, Sat Oct 1 17:05:38 2005 UTC

#	Line 1 | Line 1
1		/*
2	<	* Written by members of JCP JSR-166 Expert Group and released to the
3	<	* public domain. Use, modify, and redistribute this code in any way
4	<	* without acknowledgement. Other contributors include Andrew Wright,
5	<	* Jeffrey Hayes, Pat Fischer, Mike Judd.
2	>	* Written by Doug Lea with assistance from members of JCP JSR-166
3	>	* Expert Group and released to the public domain, as explained at
4	>	* http://creativecommons.org/licenses/publicdomain
5	>	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	>	* Pat Fisher, Mike Judd.
7		*/
8
9		import junit.framework.*;
10		import java.util.*;
11		import java.util.concurrent.*;
12		import java.io.*;
13	<
13	>	import java.security.*;
14
15		/**
16	<	* Base class for JSR166 Junit TCK tests.  Defines some constants and
17	<	* utility methods, as well as a simple framework for helping to make
18	<	* sure that assertions failing in generated threads cause the
19	<	* associated test that generated them to itself fail (which JUnit doe
20	<	* not otherwise arrange).  The rules for creating such tests are:
16	>	* Base class for JSR166 Junit TCK tests.  Defines some constants,
17	>	* utility methods and classes, as well as a simple framework for
18	>	* helping to make sure that assertions failing in generated threads
19	>	* cause the associated test that generated them to itself fail (which
20	>	* JUnit does not otherwise arrange).  The rules for creating such
21	>	* tests are:
22		*
23		* <ol>
24		*
25		* <li> All assertions in code running in generated threads must use
26	<	* the forms {@link threadFail} , {@link threadAssertTrue} {@link
27	<	* threadAssertEquals}, or {@link threadAssertNull}, (not
26	>	* the forms {@link #threadFail}, {@link #threadAssertTrue}, {@link
27	>	* #threadAssertEquals}, or {@link #threadAssertNull}, (not
28		* <tt>fail</tt>, <tt>assertTrue</tt>, etc.) It is OK (but not
29		* particularly recommended) for other code to use these forms too.
30		* Only the most typically used JUnit assertion methods are defined
31		* this way, but enough to live with.</li>
32		*
33	<	* <li> If you override {@link setUp} or {@link tearDown}, make sure
33	>	* <li> If you override {@link #setUp} or {@link #tearDown}, make sure
34		* to invoke <tt>super.setUp</tt> and <tt>super.tearDown</tt> within
35		* them. These methods are used to clear and check for thread
36		* assertion failures.</li>
37		*
38	<	* <li>All delays and timeouts must use one of the constants {@link
39	<	* SHORT_DELAY_MS}, {@link SMALL_DELAY_MS}, {@link MEDIUM_DELAY_MS},
40	<	* {@link LONG_DELAY_MS}. The idea here is that a SHORT is always
41	<	* discriminatable from zero time, and always allows enough time for
42	<	* the small amounts of computation (creating a thread, calling a few
38	>	* <li>All delays and timeouts must use one of the constants <tt>
39	>	* SHORT_DELAY_MS</tt>, <tt> SMALL_DELAY_MS</tt>, <tt> MEDIUM_DELAY_MS</tt>,
40	>	* <tt> LONG_DELAY_MS</tt>. The idea here is that a SHORT is always
41	>	* discriminable from zero time, and always allows enough time for the
42	>	* small amounts of computation (creating a thread, calling a few
43		* methods, etc) needed to reach a timeout point. Similarly, a SMALL
44		* is always discriminable as larger than SHORT and smaller than
45		* MEDIUM.  And so on. These constants are set to conservative values,
46	<	* (100, 500, 1000, 5000 MS) but even so, if there is ever any doubt,
47	<	* they can all be increased in one spot to rerun tests on slower
46	<	* platforms</li>
46	>	* but even so, if there is ever any doubt, they can all be increased
47	>	* in one spot to rerun tests on slower platforms.</li>
48		*
49		* <li> All threads generated must be joined inside each test case
50		* method (or <tt>fail</tt> to do so) before returning from the
51	<	* method. The {@link joinPool} method can be used to do this when
51	>	* method. The <tt> joinPool</tt> method can be used to do this when
52		* using Executors.</li>
53		*
54		* </ol>
55	+	*
56	+	* <p> <b>Other notes</b>
57	+	* <ul>
58	+	*
59	+	* <li> Usually, there is one testcase method per JSR166 method
60	+	* covering "normal" operation, and then as many exception-testing
61	+	* methods as there are exceptions the method can throw. Sometimes
62	+	* there are multiple tests per JSR166 method when the different
63	+	* "normal" behaviors differ significantly. And sometimes testcases
64	+	* cover multiple methods when they cannot be tested in
65	+	* isolation.</li>
66	+	*
67	+	* <li> The documentation style for testcases is to provide as javadoc
68	+	* a simple sentence or two describing the property that the testcase
69	+	* method purports to test. The javadocs do not say anything about how
70	+	* the property is tested. To find out, read the code.</li>
71	+	*
72	+	* <li> These tests are "conformance tests", and do not attempt to
73	+	* test throughput, latency, scalability or other performance factors
74	+	* (see the separate "jtreg" tests for a set intended to check these
75	+	* for the most central aspects of functionality.) So, most tests use
76	+	* the smallest sensible numbers of threads, collection sizes, etc
77	+	* needed to check basic conformance.</li>
78	+	*
79	+	* <li>The test classes currently do not declare inclusion in
80	+	* any particular package to simplify things for people integrating
81	+	* them in TCK test suites.</li>
82	+	*
83	+	* <li> As a convenience, the <tt>main</tt> of this class (JSR166TestCase)
84	+	* runs all JSR166 unit tests.</li>
85	+	*
86	+	* </ul>
87		*/
88		public class JSR166TestCase extends TestCase {
89	+	/**
90	+	* Runs all JSR166 unit tests using junit.textui.TestRunner
91	+	*/
92	+	public static void main (String[] args) {
93	+	int iters = 1;
94	+	if (args.length > 0)
95	+	iters = Integer.parseInt(args[0]);
96	+	Test s = suite();
97	+	for (int i = 0; i < iters; ++i) {
98	+	junit.textui.TestRunner.run (s);
99	+	System.gc();
100	+	System.runFinalization();
101	+	}
102	+	System.exit(0);
103	+	}
104	+
105	+	/**
106	+	* Collects all JSR166 unit tests as one suite
107	+	*/
108	+	public static Test suite ( ) {
109	+	TestSuite suite = new TestSuite("JSR166 Unit Tests");
110	+
111	+	suite.addTest(new TestSuite(AbstractExecutorServiceTest.class));
112	+	suite.addTest(new TestSuite(AbstractQueueTest.class));
113	+	suite.addTest(new TestSuite(AbstractQueuedSynchronizerTest.class));
114	+	suite.addTest(new TestSuite(AbstractQueuedLongSynchronizerTest.class));
115	+	suite.addTest(new TestSuite(ArrayBlockingQueueTest.class));
116	+	suite.addTest(new TestSuite(ArrayDequeTest.class));
117	+	suite.addTest(new TestSuite(AtomicBooleanTest.class));
118	+	suite.addTest(new TestSuite(AtomicIntegerArrayTest.class));
119	+	suite.addTest(new TestSuite(AtomicIntegerFieldUpdaterTest.class));
120	+	suite.addTest(new TestSuite(AtomicIntegerTest.class));
121	+	suite.addTest(new TestSuite(AtomicLongArrayTest.class));
122	+	suite.addTest(new TestSuite(AtomicLongFieldUpdaterTest.class));
123	+	suite.addTest(new TestSuite(AtomicLongTest.class));
124	+	suite.addTest(new TestSuite(AtomicMarkableReferenceTest.class));
125	+	suite.addTest(new TestSuite(AtomicReferenceArrayTest.class));
126	+	suite.addTest(new TestSuite(AtomicReferenceFieldUpdaterTest.class));
127	+	suite.addTest(new TestSuite(AtomicReferenceTest.class));
128	+	suite.addTest(new TestSuite(AtomicStampedReferenceTest.class));
129	+	suite.addTest(new TestSuite(ConcurrentHashMapTest.class));
130	+	suite.addTest(new TestSuite(ConcurrentLinkedQueueTest.class));
131	+	suite.addTest(new TestSuite(ConcurrentSkipListMapTest.class));
132	+	suite.addTest(new TestSuite(ConcurrentSkipListSubMapTest.class));
133	+	suite.addTest(new TestSuite(ConcurrentSkipListSetTest.class));
134	+	suite.addTest(new TestSuite(ConcurrentSkipListSubSetTest.class));
135	+	suite.addTest(new TestSuite(CopyOnWriteArrayListTest.class));
136	+	suite.addTest(new TestSuite(CopyOnWriteArraySetTest.class));
137	+	suite.addTest(new TestSuite(CountDownLatchTest.class));
138	+	suite.addTest(new TestSuite(CyclicBarrierTest.class));
139	+	suite.addTest(new TestSuite(DelayQueueTest.class));
140	+	suite.addTest(new TestSuite(EntryTest.class));
141	+	suite.addTest(new TestSuite(ExchangerTest.class));
142	+	suite.addTest(new TestSuite(ExecutorsTest.class));
143	+	suite.addTest(new TestSuite(ExecutorCompletionServiceTest.class));
144	+	suite.addTest(new TestSuite(FutureTaskTest.class));
145	+	suite.addTest(new TestSuite(LinkedBlockingDequeTest.class));
146	+	suite.addTest(new TestSuite(LinkedBlockingQueueTest.class));
147	+	suite.addTest(new TestSuite(LinkedListTest.class));
148	+	suite.addTest(new TestSuite(LockSupportTest.class));
149	+	suite.addTest(new TestSuite(PriorityBlockingQueueTest.class));
150	+	suite.addTest(new TestSuite(PriorityQueueTest.class));
151	+	suite.addTest(new TestSuite(ReentrantLockTest.class));
152	+	suite.addTest(new TestSuite(ReentrantReadWriteLockTest.class));
153	+	suite.addTest(new TestSuite(ScheduledExecutorTest.class));
154	+	suite.addTest(new TestSuite(ScheduledExecutorSubclassTest.class));
155	+	suite.addTest(new TestSuite(SemaphoreTest.class));
156	+	suite.addTest(new TestSuite(SynchronousQueueTest.class));
157	+	suite.addTest(new TestSuite(SystemTest.class));
158	+	suite.addTest(new TestSuite(ThreadLocalTest.class));
159	+	suite.addTest(new TestSuite(ThreadPoolExecutorTest.class));
160	+	suite.addTest(new TestSuite(ThreadPoolExecutorSubclassTest.class));
161	+	suite.addTest(new TestSuite(ThreadTest.class));
162	+	suite.addTest(new TestSuite(TimeUnitTest.class));
163	+	suite.addTest(new TestSuite(TreeMapTest.class));
164	+	suite.addTest(new TestSuite(TreeSetTest.class));
165	+	suite.addTest(new TestSuite(TreeSubMapTest.class));
166	+	suite.addTest(new TestSuite(TreeSubSetTest.class));
167	+
168	+	return suite;
169	+	}
170	+
171	+
172	+	public static long SHORT_DELAY_MS;
173	+	public static long SMALL_DELAY_MS;
174	+	public static long MEDIUM_DELAY_MS;
175	+	public static long LONG_DELAY_MS;
176	+
177	+
178	+	/**
179	+	* Returns the shortest timed delay. This could
180	+	* be reimplemented to use for example a Property.
181	+	*/
182	+	protected long getShortDelay() {
183	+	return 50;
184	+	}
185	+
186	+
187	+	/**
188	+	* Sets delays as multiples of SHORT_DELAY.
189	+	*/
190	+	protected  void setDelays() {
191	+	SHORT_DELAY_MS = getShortDelay();
192	+	SMALL_DELAY_MS = SHORT_DELAY_MS * 5;
193	+	MEDIUM_DELAY_MS = SHORT_DELAY_MS * 10;
194	+	LONG_DELAY_MS = SHORT_DELAY_MS * 50;
195	+	}
196
197		/**
198		* Flag set true if any threadAssert methods fail
199		*/
200	<	protected volatile boolean threadFailed;
200	>	volatile boolean threadFailed;
201
202		/**
203	<	* Initialize test to indicat that no thread assertions have failed
203	>	* Initializes test to indicate that no thread assertions have failed
204		*/
205	<	public void setUp() {
206	<	threadFailed = false;
205	>	public void setUp() {
206	>	setDelays();
207	>	threadFailed = false;
208		}
209
210		/**
211	<	* Trigger test case failure if any thread assertions have failed
211	>	* Triggers test case failure if any thread assertions have failed
212		*/
213	<	public void tearDown() {
214	<	assertFalse(threadFailed);
213	>	public void tearDown() {
214	>	assertFalse(threadFailed);
215		}
216
217	+	/**
218	+	* Fail, also setting status to indicate current testcase should fail
219	+	*/
220		public void threadFail(String reason) {
221		threadFailed = true;
222		fail(reason);
223		}
224
225	+	/**
226	+	* If expression not true, set status to indicate current testcase
227	+	* should fail
228	+	*/
229		public void threadAssertTrue(boolean b) {
230		if (!b) {
231		threadFailed = true;
232		assertTrue(b);
233		}
234		}
235	+
236	+	/**
237	+	* If expression not false, set status to indicate current testcase
238	+	* should fail
239	+	*/
240		public void threadAssertFalse(boolean b) {
241		if (b) {
242		threadFailed = true;
243		assertFalse(b);
244		}
245		}
246	+
247	+	/**
248	+	* If argument not null, set status to indicate current testcase
249	+	* should fail
250	+	*/
251		public void threadAssertNull(Object x) {
252		if (x != null) {
253		threadFailed = true;
254		assertNull(x);
255		}
256		}
257	+
258	+	/**
259	+	* If arguments not equal, set status to indicate current testcase
260	+	* should fail
261	+	*/
262		public void threadAssertEquals(long x, long y) {
263		if (x != y) {
264		threadFailed = true;
265		assertEquals(x, y);
266		}
267		}
268	+
269	+	/**
270	+	* If arguments not equal, set status to indicate current testcase
271	+	* should fail
272	+	*/
273		public void threadAssertEquals(Object x, Object y) {
274		if (x != y && (x == null || !x.equals(y))) {
275		threadFailed = true;
#	Line 110 | Line 278 | public class JSR166TestCase extends Test
278		}
279
280		/**
281	+	* threadFail with message "should throw exception"
282	+	*/
283	+	public void threadShouldThrow() {
284	+	threadFailed = true;
285	+	fail("should throw exception");
286	+	}
287	+
288	+	/**
289	+	* threadFail with message "Unexpected exception"
290	+	*/
291	+	public void threadUnexpectedException() {
292	+	threadFailed = true;
293	+	fail("Unexpected exception");
294	+	}
295	+
296	+
297	+	/**
298		* Wait out termination of a thread pool or fail doing so
299		*/
300		public void joinPool(ExecutorService exec) {
301		try {
302		exec.shutdown();
303		assertTrue(exec.awaitTermination(LONG_DELAY_MS, TimeUnit.MILLISECONDS));
304	+	} catch(SecurityException ok) {
305	+	// Allowed in case test doesn't have privs
306		} catch(InterruptedException ie) {
307	<	fail("unexpected exception");
307	>	fail("Unexpected exception");
308		}
309		}
310
311	<	public static final long SHORT_DELAY_MS =   100;
312	<	public static final long SMALL_DELAY_MS =   500;
313	<	public static final long MEDIUM_DELAY_MS = 1000;
314	<	public static final long LONG_DELAY_MS =   5000;
311	>
312	>	/**
313	>	* fail with message "should throw exception"
314	>	*/
315	>	public void shouldThrow() {
316	>	fail("Should throw exception");
317	>	}
318	>
319	>	/**
320	>	* fail with message "Unexpected exception"
321	>	*/
322	>	public void unexpectedException() {
323	>	fail("Unexpected exception");
324	>	}
325
326
327		/**
328		* The number of elements to place in collections, arrays, etc.
329		*/
330	<	public static final int SIZE = 20;
330	>	static final int SIZE = 20;
331
332		// Some convenient Integer constants
333
334	<	public static final Integer zero = new Integer(0);
335	<	public static final Integer one = new Integer(1);
336	<	public static final Integer two = new Integer(2);
337	<	public static final Integer three  = new Integer(3);
338	<	public static final Integer four  = new Integer(4);
339	<	public static final Integer five  = new Integer(5);
340	<	public static final Integer six = new Integer(6);
341	<	public static final Integer seven = new Integer(7);
342	<	public static final Integer eight = new Integer(8);
343	<	public static final Integer nine = new Integer(9);
344	<	public static final Integer m1  = new Integer(-1);
345	<	public static final Integer m2  = new Integer(-2);
346	<	public static final Integer m3  = new Integer(-3);
347	<	public static final Integer m4 = new Integer(-4);
348	<	public static final Integer m5 = new Integer(-5);
349	<	public static final Integer m10 = new Integer(-10);
334	>	static final Integer zero = new Integer(0);
335	>	static final Integer one = new Integer(1);
336	>	static final Integer two = new Integer(2);
337	>	static final Integer three  = new Integer(3);
338	>	static final Integer four  = new Integer(4);
339	>	static final Integer five  = new Integer(5);
340	>	static final Integer six = new Integer(6);
341	>	static final Integer seven = new Integer(7);
342	>	static final Integer eight = new Integer(8);
343	>	static final Integer nine = new Integer(9);
344	>	static final Integer m1  = new Integer(-1);
345	>	static final Integer m2  = new Integer(-2);
346	>	static final Integer m3  = new Integer(-3);
347	>	static final Integer m4 = new Integer(-4);
348	>	static final Integer m5 = new Integer(-5);
349	>	static final Integer m10 = new Integer(-10);
350	>
351	>
352	>	/**
353	>	* A security policy where new permissions can be dynamically added
354	>	* or all cleared.
355	>	*/
356	>	static class AdjustablePolicy extends java.security.Policy {
357	>	Permissions perms = new Permissions();
358	>	AdjustablePolicy() { }
359	>	void addPermission(Permission perm) { perms.add(perm); }
360	>	void clearPermissions() { perms = new Permissions(); }
361	>	public PermissionCollection getPermissions(CodeSource cs) {
362	>	return perms;
363	>	}
364	>	public PermissionCollection getPermissions(ProtectionDomain pd) {
365	>	return perms;
366	>	}
367	>	public boolean implies(ProtectionDomain pd, Permission p) {
368	>	return perms.implies(p);
369	>	}
370	>	public void refresh() {}
371	>	}
372
373
374		// Some convenient Runnable classes
375
376	<	public static class NoOpRunnable implements Runnable {
376	>	static class NoOpRunnable implements Runnable {
377		public void run() {}
378		}
379
380	<	public static class NoOpCallable implements Callable {
380	>	static class NoOpCallable implements Callable {
381		public Object call() { return Boolean.TRUE; }
382		}
383
384	<	public class ShortRunnable implements Runnable {
384	>	static final String TEST_STRING = "a test string";
385	>
386	>	static class StringTask implements Callable<String> {
387	>	public String call() { return TEST_STRING; }
388	>	}
389	>
390	>	static class NPETask implements Callable<String> {
391	>	public String call() { throw new NullPointerException(); }
392	>	}
393	>
394	>	static class CallableOne implements Callable<Integer> {
395	>	public Integer call() { return one; }
396	>	}
397	>
398	>	class ShortRunnable implements Runnable {
399		public void run() {
400		try {
401		Thread.sleep(SHORT_DELAY_MS);
402		}
403		catch(Exception e) {
404	<	threadFail("unexpectedException");
404	>	threadUnexpectedException();
405		}
406		}
407		}
408
409	<	public class ShortInterruptedRunnable implements Runnable {
409	>	class ShortInterruptedRunnable implements Runnable {
410		public void run() {
411		try {
412		Thread.sleep(SHORT_DELAY_MS);
413	<	threadFail("should throw IE");
413	>	threadShouldThrow();
414		}
415		catch(InterruptedException success) {
416		}
417		}
418		}
419
420	<	public class SmallRunnable implements Runnable {
420	>	class SmallRunnable implements Runnable {
421		public void run() {
422		try {
423		Thread.sleep(SMALL_DELAY_MS);
424		}
425		catch(Exception e) {
426	<	threadFail("unexpectedException");
426	>	threadUnexpectedException();
427		}
428		}
429		}
430
431	<	public class SmallCallable implements Callable {
431	>	class SmallPossiblyInterruptedRunnable implements Runnable {
432	>	public void run() {
433	>	try {
434	>	Thread.sleep(SMALL_DELAY_MS);
435	>	}
436	>	catch(Exception e) {
437	>	}
438	>	}
439	>	}
440	>
441	>	class SmallCallable implements Callable {
442		public Object call() {
443		try {
444		Thread.sleep(SMALL_DELAY_MS);
445		}
446		catch(Exception e) {
447	<	threadFail("unexpectedException");
447	>	threadUnexpectedException();
448		}
449		return Boolean.TRUE;
450		}
451		}
452
453	<	public class SmallInterruptedRunnable implements Runnable {
453	>	class SmallInterruptedRunnable implements Runnable {
454		public void run() {
455		try {
456		Thread.sleep(SMALL_DELAY_MS);
457	<	threadFail("should throw IE");
457	>	threadShouldThrow();
458		}
459		catch(InterruptedException success) {
460		}
#	Line 219 | Line 462 | public class JSR166TestCase extends Test
462		}
463
464
465	<	public class MediumRunnable implements Runnable {
465	>	class MediumRunnable implements Runnable {
466		public void run() {
467		try {
468		Thread.sleep(MEDIUM_DELAY_MS);
469		}
470		catch(Exception e) {
471	<	threadFail("unexpectedException");
471	>	threadUnexpectedException();
472		}
473		}
474		}
475
476	<	public class MediumInterruptedRunnable implements Runnable {
476	>	class MediumInterruptedRunnable implements Runnable {
477		public void run() {
478		try {
479		Thread.sleep(MEDIUM_DELAY_MS);
480	<	threadFail("should throw IE");
480	>	threadShouldThrow();
481		}
482		catch(InterruptedException success) {
483		}
484		}
485		}
486
487	<	public class MediumPossiblyInterruptedRunnable implements Runnable {
487	>	class MediumPossiblyInterruptedRunnable implements Runnable {
488		public void run() {
489		try {
490		Thread.sleep(MEDIUM_DELAY_MS);
#	Line 250 | Line 493 | public class JSR166TestCase extends Test
493		}
494		}
495		}
496	<
496	>
497	>	class LongPossiblyInterruptedRunnable implements Runnable {
498	>	public void run() {
499	>	try {
500	>	Thread.sleep(LONG_DELAY_MS);
501	>	}
502	>	catch(InterruptedException success) {
503	>	}
504	>	}
505	>	}
506	>
507	>	/**
508	>	* For use as ThreadFactory in constructors
509	>	*/
510	>	static class SimpleThreadFactory implements ThreadFactory{
511	>	public Thread newThread(Runnable r){
512	>	return new Thread(r);
513	>	}
514	>	}
515	>
516	>	static class TrackedShortRunnable implements Runnable {
517	>	volatile boolean done = false;
518	>	public void run() {
519	>	try {
520	>	Thread.sleep(SMALL_DELAY_MS);
521	>	done = true;
522	>	} catch(Exception e){
523	>	}
524	>	}
525	>	}
526	>
527	>	static class TrackedMediumRunnable implements Runnable {
528	>	volatile boolean done = false;
529	>	public void run() {
530	>	try {
531	>	Thread.sleep(MEDIUM_DELAY_MS);
532	>	done = true;
533	>	} catch(Exception e){
534	>	}
535	>	}
536	>	}
537	>
538	>	static class TrackedLongRunnable implements Runnable {
539	>	volatile boolean done = false;
540	>	public void run() {
541	>	try {
542	>	Thread.sleep(LONG_DELAY_MS);
543	>	done = true;
544	>	} catch(Exception e){
545	>	}
546	>	}
547	>	}
548	>
549	>	static class TrackedNoOpRunnable implements Runnable {
550	>	volatile boolean done = false;
551	>	public void run() {
552	>	done = true;
553	>	}
554	>	}
555	>
556	>	static class TrackedCallable implements Callable {
557	>	volatile boolean done = false;
558	>	public Object call() {
559	>	try {
560	>	Thread.sleep(SMALL_DELAY_MS);
561	>	done = true;
562	>	} catch(Exception e){
563	>	}
564	>	return Boolean.TRUE;
565	>	}
566	>	}
567	>
568	>
569	>	/**
570	>	* For use as RejectedExecutionHandler in constructors
571	>	*/
572	>	static class NoOpREHandler implements RejectedExecutionHandler{
573	>	public void rejectedExecution(Runnable r, ThreadPoolExecutor executor){}
574	>	}
575	>
576	>
577		}

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