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

Comparing jsr166/src/test/tck/ForkJoinPoolTest.java (file contents):
Revision 1.20 by dl, Wed Aug 11 19:50:02 2010 UTC vs.
Revision 1.32 by jsr166, Mon Oct 11 04:39:12 2010 UTC

#	Line 4 | Line 4
4		* http://creativecommons.org/licenses/publicdomain
5		*/
6
7	–
7		import junit.framework.*;
8	<	import java.util.*;
9	<	import java.util.concurrent.Executor;
8	>	import java.util.ArrayList;
9	>	import java.util.Collection;
10	>	import java.util.List;
11		import java.util.concurrent.Executors;
12		import java.util.concurrent.ExecutorService;
13		import java.util.concurrent.AbstractExecutorService;
#	Line 20 | Line 20 | import java.util.concurrent.RejectedExec
20		import java.util.concurrent.ForkJoinPool;
21		import java.util.concurrent.ForkJoinTask;
22		import java.util.concurrent.ForkJoinWorkerThread;
23	–	import java.util.concurrent.RecursiveAction;
23		import java.util.concurrent.RecursiveTask;
24		import java.util.concurrent.TimeUnit;
25	<	import java.util.concurrent.locks.*;
26	<	import java.security.*;
25	>	import java.util.concurrent.locks.ReentrantLock;
26	>	import static java.util.concurrent.TimeUnit.MILLISECONDS;
27	>	import java.security.AccessControlException;
28	>	import java.security.Policy;
29	>	import java.security.PrivilegedAction;
30	>	import java.security.PrivilegedExceptionAction;
31
32		public class ForkJoinPoolTest extends JSR166TestCase {
33		public static void main(String[] args) {
34	<	junit.textui.TestRunner.run (suite());
34	>	junit.textui.TestRunner.run(suite());
35		}
36	+
37		public static Test suite() {
38		return new TestSuite(ForkJoinPoolTest.class);
39		}
#	Line 156 | Line 160 | public class ForkJoinPoolTest extends JS
160		* tasks, and quiescent running state.
161		*/
162		public void testDefaultInitialState() {
163	<	ForkJoinPool p = null;
163	>	ForkJoinPool p = new ForkJoinPool(1);
164		try {
165	<	p = new ForkJoinPool(1);
166	<	assertTrue(p.getFactory() ==
163	<	ForkJoinPool.defaultForkJoinWorkerThreadFactory);
165	>	assertSame(ForkJoinPool.defaultForkJoinWorkerThreadFactory,
166	>	p.getFactory());
167		assertTrue(p.isQuiescent());
168		assertFalse(p.getAsyncMode());
169	<	assertTrue(p.getActiveThreadCount() == 0);
170	<	assertTrue(p.getStealCount() == 0);
171	<	assertTrue(p.getQueuedTaskCount() == 0);
172	<	assertTrue(p.getQueuedSubmissionCount() == 0);
169	>	assertEquals(0, p.getActiveThreadCount());
170	>	assertEquals(0, p.getStealCount());
171	>	assertEquals(0, p.getQueuedTaskCount());
172	>	assertEquals(0, p.getQueuedSubmissionCount());
173		assertFalse(p.hasQueuedSubmissions());
174		assertFalse(p.isShutdown());
175		assertFalse(p.isTerminating());
#	Line 201 | Line 204 | public class ForkJoinPoolTest extends JS
204		* getParallelism returns size set in constructor
205		*/
206		public void testGetParallelism() {
207	<	ForkJoinPool p = null;
207	>	ForkJoinPool p = new ForkJoinPool(1);
208		try {
209	<	p = new ForkJoinPool(1);
207	<	assertTrue(p.getParallelism() == 1);
209	>	assertEquals(1, p.getParallelism());
210		} finally {
211		joinPool(p);
212		}
#	Line 214 | Line 216 | public class ForkJoinPoolTest extends JS
216		* getPoolSize returns number of started workers.
217		*/
218		public void testGetPoolSize() {
219	<	ForkJoinPool p = null;
219	>	ForkJoinPool p = new ForkJoinPool(1);
220		try {
221	<	p = new ForkJoinPool(1);
220	<	assertTrue(p.getActiveThreadCount() == 0);
221	>	assertEquals(0, p.getActiveThreadCount());
222		Future<String> future = p.submit(new StringTask());
223	<	assertTrue(p.getPoolSize() == 1);
223	<
223	>	assertEquals(1, p.getPoolSize());
224		} finally {
225		joinPool(p);
226		}
#	Line 233 | Line 233 | public class ForkJoinPoolTest extends JS
233		* performs its defined action
234		*/
235		public void testSetUncaughtExceptionHandler() throws InterruptedException {
236	<	ForkJoinPool p = null;
237	<	try {
238	<	MyHandler eh = new MyHandler();
239	<	p = new ForkJoinPool(1, new FailingThreadFactory(), eh, false);
240	<	assert(eh == p.getUncaughtExceptionHandler());
241	<	p.execute(new FailingTask());
242	<	Thread.sleep(MEDIUM_DELAY_MS);
243	<	assertTrue(eh.catches > 0);
236	>	final CountDownLatch uehInvoked = new CountDownLatch(1);
237	>	final Thread.UncaughtExceptionHandler eh =
238	>	new Thread.UncaughtExceptionHandler() {
239	>	public void uncaughtException(Thread t, Throwable e) {
240	>	uehInvoked.countDown();
241	>	}};
242	>	ForkJoinPool p = new ForkJoinPool(1, new FailingThreadFactory(),
243	>	eh, false);
244	>	try {
245	>	assertSame(eh, p.getUncaughtExceptionHandler());
246	>	p.execute(new FibTask(8));
247	>	assertTrue(uehInvoked.await(MEDIUM_DELAY_MS, MILLISECONDS));
248		} finally {
249	<	p.shutdownNow();
249	>	p.shutdownNow(); // failure might have prevented processing task
250		joinPool(p);
251		}
252		}
#	Line 253 | Line 257 | public class ForkJoinPoolTest extends JS
257		* construction parameters continue to hold
258		*/
259		public void testisQuiescent() throws InterruptedException {
260	<	ForkJoinPool p = null;
260	>	ForkJoinPool p = new ForkJoinPool(2);
261		try {
262	<	p = new ForkJoinPool(2);
262	>	assertTrue(p.isQuiescent());
263		p.invoke(new FibTask(20));
264	<	assertTrue(p.getFactory() ==
265	<	ForkJoinPool.defaultForkJoinWorkerThreadFactory);
266	<	Thread.sleep(MEDIUM_DELAY_MS);
264	>	assertSame(ForkJoinPool.defaultForkJoinWorkerThreadFactory,
265	>	p.getFactory());
266	>	Thread.sleep(SMALL_DELAY_MS);
267		assertTrue(p.isQuiescent());
268		assertFalse(p.getAsyncMode());
269	<	assertTrue(p.getActiveThreadCount() == 0);
270	<	assertTrue(p.getQueuedTaskCount() == 0);
271	<	assertTrue(p.getQueuedSubmissionCount() == 0);
269	>	assertEquals(0, p.getActiveThreadCount());
270	>	assertEquals(0, p.getQueuedTaskCount());
271	>	assertEquals(0, p.getQueuedSubmissionCount());
272		assertFalse(p.hasQueuedSubmissions());
273		assertFalse(p.isShutdown());
274		assertFalse(p.isTerminating());
#	Line 278 | Line 282 | public class ForkJoinPoolTest extends JS
282		* Completed submit(ForkJoinTask) returns result
283		*/
284		public void testSubmitForkJoinTask() throws Throwable {
285	<	ForkJoinPool p = null;
285	>	ForkJoinPool p = new ForkJoinPool(1);
286		try {
283	–	p = new ForkJoinPool(1);
287		ForkJoinTask<Integer> f = p.submit(new FibTask(8));
288	<	int r = f.get();
286	<	assertTrue(r == 21);
288	>	assertEquals(21, (int) f.get());
289		} finally {
290		joinPool(p);
291		}
#	Line 293 | Line 295 | public class ForkJoinPoolTest extends JS
295		* A task submitted after shutdown is rejected
296		*/
297		public void testSubmitAfterShutdown() {
298	<	ForkJoinPool p = null;
298	>	ForkJoinPool p = new ForkJoinPool(1);
299		try {
298	–	p = new ForkJoinPool(1);
300		p.shutdown();
301		assertTrue(p.isShutdown());
302	<	ForkJoinTask<Integer> f = p.submit(new FibTask(8));
303	<	shouldThrow();
304	<	} catch (RejectedExecutionException success) {
302	>	try {
303	>	ForkJoinTask<Integer> f = p.submit(new FibTask(8));
304	>	shouldThrow();
305	>	} catch (RejectedExecutionException success) {}
306		} finally {
307		joinPool(p);
308		}
#	Line 310 | Line 312 | public class ForkJoinPoolTest extends JS
312		* Pool maintains parallelism when using ManagedBlocker
313		*/
314		public void testBlockingForkJoinTask() throws Throwable {
315	<	ForkJoinPool p = null;
315	>	ForkJoinPool p = new ForkJoinPool(4);
316		try {
315	–	p = new ForkJoinPool(4);
317		ReentrantLock lock = new ReentrantLock();
318		ManagedLocker locker = new ManagedLocker(lock);
319	<	ForkJoinTask<Integer> f = new LockingFibTask(30, locker, lock);
319	>	ForkJoinTask<Integer> f = new LockingFibTask(20, locker, lock);
320		p.execute(f);
321	<	int r = f.get();
321	<	assertTrue(r == 832040);
321	>	assertEquals(6765, (int) f.get());
322		} finally {
323		p.shutdownNow(); // don't wait out shutdown
324		}
#	Line 328 | Line 328 | public class ForkJoinPoolTest extends JS
328		* pollSubmission returns unexecuted submitted task, if present
329		*/
330		public void testPollSubmission() {
331	<	SubFJP p = null;
331	>	SubFJP p = new SubFJP();
332		try {
333	<	p = new SubFJP();
334	<	ForkJoinTask a = p.submit(new MediumRunnable());
335	<	ForkJoinTask b = p.submit(new MediumRunnable());
336	<	ForkJoinTask c = p.submit(new MediumRunnable());
333	>	ForkJoinTask a = p.submit(new ShortRunnable());
334	>	ForkJoinTask b = p.submit(new ShortRunnable());
335	>	ForkJoinTask c = p.submit(new ShortRunnable());
336		ForkJoinTask r = p.pollSubmission();
337		assertTrue(r == a || r == b || r == c);
338		assertFalse(r.isDone());
#	Line 346 | Line 345 | public class ForkJoinPoolTest extends JS
345		* drainTasksTo transfers unexecuted submitted tasks, if present
346		*/
347		public void testDrainTasksTo() {
348	<	SubFJP p = null;
348	>	SubFJP p = new SubFJP();
349		try {
350	<	p = new SubFJP();
351	<	ForkJoinTask a = p.submit(new MediumRunnable());
352	<	ForkJoinTask b = p.submit(new MediumRunnable());
354	<	ForkJoinTask c = p.submit(new MediumRunnable());
350	>	ForkJoinTask a = p.submit(new ShortRunnable());
351	>	ForkJoinTask b = p.submit(new ShortRunnable());
352	>	ForkJoinTask c = p.submit(new ShortRunnable());
353		ArrayList<ForkJoinTask> al = new ArrayList();
354		p.drainTasksTo(al);
355		assertTrue(al.size() > 0);
#	Line 372 | Line 370 | public class ForkJoinPoolTest extends JS
370		*/
371		public void testExecuteRunnable() throws Throwable {
372		ExecutorService e = new ForkJoinPool(1);
373	<	TrackedShortRunnable task = new TrackedShortRunnable();
374	<	assertFalse(task.done);
375	<	Future<?> future = e.submit(task);
376	<	future.get();
377	<	assertTrue(task.done);
373	>	try {
374	>	TrackedRunnable task = trackedRunnable(SHORT_DELAY_MS);
375	>	assertFalse(task.isDone());
376	>	Future<?> future = e.submit(task);
377	>	future.get();
378	>	assertTrue(task.isDone());
379	>	} finally {
380	>	joinPool(e);
381	>	}
382		}
383
384
#	Line 385 | Line 387 | public class ForkJoinPoolTest extends JS
387		*/
388		public void testSubmitCallable() throws Throwable {
389		ExecutorService e = new ForkJoinPool(1);
390	<	Future<String> future = e.submit(new StringTask());
391	<	String result = future.get();
392	<	assertSame(TEST_STRING, result);
390	>	try {
391	>	Future<String> future = e.submit(new StringTask());
392	>	String result = future.get();
393	>	assertSame(TEST_STRING, result);
394	>	} finally {
395	>	joinPool(e);
396	>	}
397		}
398
399		/**
#	Line 395 | Line 401 | public class ForkJoinPoolTest extends JS
401		*/
402		public void testSubmitRunnable() throws Throwable {
403		ExecutorService e = new ForkJoinPool(1);
404	<	Future<?> future = e.submit(new NoOpRunnable());
405	<	future.get();
406	<	assertTrue(future.isDone());
404	>	try {
405	>	Future<?> future = e.submit(new NoOpRunnable());
406	>	future.get();
407	>	assertTrue(future.isDone());
408	>	} finally {
409	>	joinPool(e);
410	>	}
411		}
412
413		/**
#	Line 405 | Line 415 | public class ForkJoinPoolTest extends JS
415		*/
416		public void testSubmitRunnable2() throws Throwable {
417		ExecutorService e = new ForkJoinPool(1);
418	<	Future<String> future = e.submit(new NoOpRunnable(), TEST_STRING);
419	<	String result = future.get();
420	<	assertSame(TEST_STRING, result);
418	>	try {
419	>	Future<String> future = e.submit(new NoOpRunnable(), TEST_STRING);
420	>	String result = future.get();
421	>	assertSame(TEST_STRING, result);
422	>	} finally {
423	>	joinPool(e);
424	>	}
425		}
426
427
#	Line 425 | Line 439 | public class ForkJoinPoolTest extends JS
439		} catch (AccessControlException ok) {
440		return;
441		}
442	+
443		try {
444		ExecutorService e = new ForkJoinPool(1);
445	<	Future future = e.submit(Executors.callable(new PrivilegedAction() {
445	>	try {
446	>	Future future = e.submit(Executors.callable(new PrivilegedAction() {
447		public Object run() {
448		return TEST_STRING;
449		}}));
450
451	<	Object result = future.get();
452	<	assertSame(TEST_STRING, result);
453	<	}
454	<	finally {
451	>	Object result = future.get();
452	>	assertSame(TEST_STRING, result);
453	>	} finally {
454	>	joinPool(e);
455	>	}
456	>	} finally {
457		Policy.setPolicy(savedPolicy);
458		}
459		}
#	Line 457 | Line 475 | public class ForkJoinPoolTest extends JS
475
476		try {
477		ExecutorService e = new ForkJoinPool(1);
478	<	Future future = e.submit(Executors.callable(new PrivilegedExceptionAction() {
478	>	try {
479	>	Future future = e.submit(Executors.callable(new PrivilegedExceptionAction() {
480		public Object run() {
481		return TEST_STRING;
482		}}));
483
484	<	Object result = future.get();
485	<	assertSame(TEST_STRING, result);
486	<	}
487	<	finally {
484	>	Object result = future.get();
485	>	assertSame(TEST_STRING, result);
486	>	} finally {
487	>	joinPool(e);
488	>	}
489	>	} finally {
490		Policy.setPolicy(savedPolicy);
491		}
492		}
#	Line 485 | Line 506 | public class ForkJoinPoolTest extends JS
506		return;
507		}
508
488	–
509		try {
510		ExecutorService e = new ForkJoinPool(1);
511	<	Future future = e.submit(Executors.callable(new PrivilegedExceptionAction() {
511	>	try {
512	>	Future future = e.submit(Executors.callable(new PrivilegedExceptionAction() {
513		public Object run() throws Exception {
514		throw new IndexOutOfBoundsException();
515		}}));
516
517	<	Object result = future.get();
518	<	shouldThrow();
519	<	} catch (ExecutionException success) {
520	<	assertTrue(success.getCause() instanceof IndexOutOfBoundsException);
517	>	Object result = future.get();
518	>	shouldThrow();
519	>	} catch (ExecutionException success) {
520	>	assertTrue(success.getCause() instanceof IndexOutOfBoundsException);
521	>	} finally {
522	>	joinPool(e);
523	>	}
524		} finally {
525		Policy.setPolicy(savedPolicy);
526		}
#	Line 506 | Line 530 | public class ForkJoinPoolTest extends JS
530		* execute(null runnable) throws NullPointerException
531		*/
532		public void testExecuteNullRunnable() {
533	+	ExecutorService e = new ForkJoinPool(1);
534		try {
535	<	ExecutorService e = new ForkJoinPool(1);
511	<	TrackedShortRunnable task = null;
512	<	Future<?> future = e.submit(task);
535	>	Future<?> future = e.submit((Runnable) null);
536		shouldThrow();
537	<	} catch (NullPointerException success) {}
537	>	} catch (NullPointerException success) {
538	>	} finally {
539	>	joinPool(e);
540	>	}
541		}
542
543
#	Line 519 | Line 545 | public class ForkJoinPoolTest extends JS
545		* submit(null callable) throws NullPointerException
546		*/
547		public void testSubmitNullCallable() {
548	+	ExecutorService e = new ForkJoinPool(1);
549		try {
550	<	ExecutorService e = new ForkJoinPool(1);
524	<	StringTask t = null;
525	<	Future<String> future = e.submit(t);
550	>	Future<String> future = e.submit((Callable) null);
551		shouldThrow();
552	<	} catch (NullPointerException success) {}
552	>	} catch (NullPointerException success) {
553	>	} finally {
554	>	joinPool(e);
555	>	}
556		}
557
558
559		/**
560	<	* Blocking on submit(callable) throws InterruptedException if
533	<	* caller interrupted.
560	>	* submit(callable).get() throws InterruptedException if interrupted
561		*/
562		public void testInterruptedSubmit() throws InterruptedException {
563	<	final ForkJoinPool p = new ForkJoinPool(1);
564	<
565	<	Thread t = new Thread(new CheckedInterruptedRunnable() {
566	<	public void realRun() throws Throwable {
567	<	p.submit(new CheckedCallable<Object>() {
568	<	public Object realCall() throws Throwable {
569	<	try {
570	<	Thread.sleep(MEDIUM_DELAY_MS);
571	<	} catch (InterruptedException ok) {
572	<	}
573	<	return null;
574	<	}}).get();
575	<	}});
576	<
577	<	t.start();
578	<	Thread.sleep(SHORT_DELAY_MS);
579	<	t.interrupt();
580	<	t.join();
581	<	p.shutdownNow();
582	<	joinPool(p);
563	>	final CountDownLatch submitted    = new CountDownLatch(1);
564	>	final CountDownLatch quittingTime = new CountDownLatch(1);
565	>	final ExecutorService p = new ForkJoinPool(1);
566	>	final Callable<Void> awaiter = new CheckedCallable<Void>() {
567	>	public Void realCall() throws InterruptedException {
568	>	assertTrue(quittingTime.await(MEDIUM_DELAY_MS, MILLISECONDS));
569	>	return null;
570	>	}};
571	>	try {
572	>	Thread t = new Thread(new CheckedInterruptedRunnable() {
573	>	public void realRun() throws Exception {
574	>	Future<Void> future = p.submit(awaiter);
575	>	submitted.countDown();
576	>	future.get();
577	>	}});
578	>	t.start();
579	>	assertTrue(submitted.await(MEDIUM_DELAY_MS, MILLISECONDS));
580	>	t.interrupt();
581	>	t.join();
582	>	} finally {
583	>	quittingTime.countDown();
584	>	joinPool(p);
585	>	}
586		}
587
588		/**
#	Line 570 | Line 600 | public class ForkJoinPoolTest extends JS
600		shouldThrow();
601		} catch (ExecutionException success) {
602		assertTrue(success.getCause() instanceof ArithmeticException);
603	+	} finally {
604	+	joinPool(p);
605		}
574	–
575	–	joinPool(p);
606		}
607
608		/**
#	Line 761 | Line 791 | public class ForkJoinPoolTest extends JS
791		public void testTimedInvokeAny1() throws Throwable {
792		ExecutorService e = new ForkJoinPool(1);
793		try {
794	<	e.invokeAny(null, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
794	>	e.invokeAny(null, MEDIUM_DELAY_MS, MILLISECONDS);
795		shouldThrow();
796		} catch (NullPointerException success) {
797		} finally {
#	Line 792 | Line 822 | public class ForkJoinPoolTest extends JS
822		ExecutorService e = new ForkJoinPool(1);
823		try {
824		e.invokeAny(new ArrayList<Callable<String>>(),
825	<	MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
825	>	MEDIUM_DELAY_MS, MILLISECONDS);
826		shouldThrow();
827		} catch (IllegalArgumentException success) {
828		} finally {
#	Line 810 | Line 840 | public class ForkJoinPoolTest extends JS
840		l.add(latchAwaitingStringTask(latch));
841		l.add(null);
842		try {
843	<	e.invokeAny(l, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
843	>	e.invokeAny(l, MEDIUM_DELAY_MS, MILLISECONDS);
844		shouldThrow();
845		} catch (NullPointerException success) {
846		} finally {
#	Line 827 | Line 857 | public class ForkJoinPoolTest extends JS
857		List<Callable<String>> l = new ArrayList<Callable<String>>();
858		l.add(new NPETask());
859		try {
860	<	e.invokeAny(l, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
860	>	e.invokeAny(l, MEDIUM_DELAY_MS, MILLISECONDS);
861		shouldThrow();
862		} catch (ExecutionException success) {
863		assertTrue(success.getCause() instanceof NullPointerException);
#	Line 845 | Line 875 | public class ForkJoinPoolTest extends JS
875		List<Callable<String>> l = new ArrayList<Callable<String>>();
876		l.add(new StringTask());
877		l.add(new StringTask());
878	<	String result = e.invokeAny(l, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
878	>	String result = e.invokeAny(l, MEDIUM_DELAY_MS, MILLISECONDS);
879		assertSame(TEST_STRING, result);
880		} finally {
881		joinPool(e);
#	Line 858 | Line 888 | public class ForkJoinPoolTest extends JS
888		public void testTimedInvokeAll1() throws Throwable {
889		ExecutorService e = new ForkJoinPool(1);
890		try {
891	<	e.invokeAll(null, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
891	>	e.invokeAll(null, MEDIUM_DELAY_MS, MILLISECONDS);
892		shouldThrow();
893		} catch (NullPointerException success) {
894		} finally {
#	Line 890 | Line 920 | public class ForkJoinPoolTest extends JS
920		try {
921		List<Future<String>> r
922		= e.invokeAll(new ArrayList<Callable<String>>(),
923	<	MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
923	>	MEDIUM_DELAY_MS, MILLISECONDS);
924		assertTrue(r.isEmpty());
925		} finally {
926		joinPool(e);
#	Line 906 | Line 936 | public class ForkJoinPoolTest extends JS
936		l.add(new StringTask());
937		l.add(null);
938		try {
939	<	e.invokeAll(l, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
939	>	e.invokeAll(l, MEDIUM_DELAY_MS, MILLISECONDS);
940		shouldThrow();
941		} catch (NullPointerException success) {
942		} finally {
#	Line 922 | Line 952 | public class ForkJoinPoolTest extends JS
952		List<Callable<String>> l = new ArrayList<Callable<String>>();
953		l.add(new NPETask());
954		List<Future<String>> futures
955	<	= e.invokeAll(l, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
955	>	= e.invokeAll(l, MEDIUM_DELAY_MS, MILLISECONDS);
956		assertEquals(1, futures.size());
957		try {
958		futures.get(0).get();
#	Line 944 | Line 974 | public class ForkJoinPoolTest extends JS
974		l.add(new StringTask());
975		l.add(new StringTask());
976		List<Future<String>> futures
977	<	= e.invokeAll(l, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
977	>	= e.invokeAll(l, MEDIUM_DELAY_MS, MILLISECONDS);
978		assertEquals(2, futures.size());
979		for (Future<String> future : futures)
980		assertSame(TEST_STRING, future.get());

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