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Comparing jsr166/src/test/tck/SubmissionPublisherTest.java (file contents):
Revision 1.4 by jsr166, Mon Sep 7 20:33:41 2015 UTC vs.
Revision 1.16 by dl, Sun Dec 11 22:11:45 2016 UTC

# Line 5 | Line 5
5   * http://creativecommons.org/publicdomain/zero/1.0/
6   */
7  
8 < import static java.util.concurrent.TimeUnit.MILLISECONDS;
9 < import static java.util.concurrent.TimeUnit.SECONDS;
10 <
8 > import java.util.concurrent.CompletableFuture;
9   import java.util.concurrent.Executor;
10   import java.util.concurrent.Executors;
11   import java.util.concurrent.Flow;
14 – import static java.util.concurrent.Flow.Publisher;
15 – import static java.util.concurrent.Flow.Subscriber;
16 – import static java.util.concurrent.Flow.Subscription;
17 – import java.util.concurrent.LinkedBlockingQueue;
12   import java.util.concurrent.ForkJoinPool;
13   import java.util.concurrent.SubmissionPublisher;
20 – import java.util.concurrent.ThreadFactory;
21 – import java.util.concurrent.ThreadPoolExecutor;
22 – import java.util.concurrent.TimeUnit;
14   import java.util.concurrent.atomic.AtomicInteger;
24 – import java.util.function.BiConsumer;
25 – import java.util.function.BiPredicate;
26 – import java.util.function.BiFunction;
27 –
15   import junit.framework.Test;
16   import junit.framework.TestSuite;
17  
18 + import static java.util.concurrent.Flow.Subscriber;
19 + import static java.util.concurrent.Flow.Subscription;
20 + import static java.util.concurrent.TimeUnit.MILLISECONDS;
21 +
22   public class SubmissionPublisherTest extends JSR166TestCase {
23  
24      public static void main(String[] args) {
# Line 37 | Line 28 | public class SubmissionPublisherTest ext
28          return new TestSuite(SubmissionPublisherTest.class);
29      }
30  
31 <    // Factory for single thread pool in case commonPool parallelism is zero
41 <    static final class DaemonThreadFactory implements ThreadFactory {
42 <        public Thread newThread(Runnable r) {
43 <            Thread t = new Thread(r);
44 <            t.setDaemon(true);
45 <            return t;
46 <        }
47 <    }
48 <
49 <    static final Executor basicExecutor =
50 <        (ForkJoinPool.getCommonPoolParallelism() > 0) ?
51 <        ForkJoinPool.commonPool() :
52 <        new ThreadPoolExecutor(1, 1, 60, SECONDS,
53 <                               new LinkedBlockingQueue<Runnable>(),
54 <                               new DaemonThreadFactory());
31 >    final Executor basicExecutor = basicPublisher().getExecutor();
32  
33      static SubmissionPublisher<Integer> basicPublisher() {
34 <        return new SubmissionPublisher<Integer>(basicExecutor,
58 <                                                Flow.defaultBufferSize());
34 >        return new SubmissionPublisher<Integer>();
35      }
36  
37      static class SPException extends RuntimeException {}
# Line 153 | Line 129 | public class SubmissionPublisherTest ext
129       */
130      void checkInitialState(SubmissionPublisher<?> p) {
131          assertFalse(p.hasSubscribers());
132 <        assertEquals(p.getNumberOfSubscribers(), 0);
132 >        assertEquals(0, p.getNumberOfSubscribers());
133          assertTrue(p.getSubscribers().isEmpty());
134          assertFalse(p.isClosed());
135          assertNull(p.getClosedException());
136          int n = p.getMaxBufferCapacity();
137          assertTrue((n & (n - 1)) == 0); // power of two
138          assertNotNull(p.getExecutor());
139 <        assertEquals(p.estimateMinimumDemand(), 0);
140 <        assertEquals(p.estimateMaximumLag(), 0);
139 >        assertEquals(0, p.estimateMinimumDemand());
140 >        assertEquals(0, p.estimateMaximumLag());
141      }
142  
143      /**
144       * A default-constructed SubmissionPublisher has no subscribers,
145       * is not closed, has default buffer size, and uses the
146 <     * ForkJoinPool.commonPool executor
146 >     * defaultExecutor
147       */
148      public void testConstructor1() {
149          SubmissionPublisher<Integer> p = new SubmissionPublisher<Integer>();
150          checkInitialState(p);
175 –        assertSame(p.getExecutor(), ForkJoinPool.commonPool());
151          assertEquals(p.getMaxBufferCapacity(), Flow.defaultBufferSize());
152 +        Executor e = p.getExecutor(), c = ForkJoinPool.commonPool();
153 +        if (ForkJoinPool.getCommonPoolParallelism() > 1)
154 +            assertSame(e, c);
155 +        else
156 +            assertNotSame(e, c);
157      }
158  
159      /**
# Line 185 | Line 165 | public class SubmissionPublisherTest ext
165          SubmissionPublisher<Integer> p = new SubmissionPublisher<Integer>(e, 8);
166          checkInitialState(p);
167          assertSame(p.getExecutor(), e);
168 <        assertEquals(p.getMaxBufferCapacity(), 8);
168 >        assertEquals(8, p.getMaxBufferCapacity());
169      }
170  
171      /**
# Line 264 | Line 244 | public class SubmissionPublisherTest ext
244          SubmissionPublisher<Integer> p = basicPublisher();
245          p.subscribe(s);
246          assertTrue(p.hasSubscribers());
247 <        assertEquals(p.getNumberOfSubscribers(), 1);
247 >        assertEquals(1, p.getNumberOfSubscribers());
248          assertTrue(p.getSubscribers().contains(s));
249          assertTrue(p.isSubscribed(s));
250          s.awaitSubscribe();
251          assertNotNull(s.sn);
252 <        assertEquals(s.nexts, 0);
253 <        assertEquals(s.errors, 0);
254 <        assertEquals(s.completes, 0);
252 >        assertEquals(0, s.nexts);
253 >        assertEquals(0, s.errors);
254 >        assertEquals(0, s.completes);
255          TestSubscriber s2 = new TestSubscriber();
256          p.subscribe(s2);
257          assertTrue(p.hasSubscribers());
258 <        assertEquals(p.getNumberOfSubscribers(), 2);
258 >        assertEquals(2, p.getNumberOfSubscribers());
259          assertTrue(p.getSubscribers().contains(s));
260          assertTrue(p.getSubscribers().contains(s2));
261          assertTrue(p.isSubscribed(s));
262          assertTrue(p.isSubscribed(s2));
263          s2.awaitSubscribe();
264          assertNotNull(s2.sn);
265 <        assertEquals(s2.nexts, 0);
266 <        assertEquals(s2.errors, 0);
267 <        assertEquals(s2.completes, 0);
265 >        assertEquals(0, s2.nexts);
266 >        assertEquals(0, s2.errors);
267 >        assertEquals(0, s2.completes);
268 >        p.close();
269      }
270  
271      /**
# Line 297 | Line 278 | public class SubmissionPublisherTest ext
278          p.close();
279          p.subscribe(s);
280          s.awaitComplete();
281 <        assertEquals(s.nexts, 0);
282 <        assertEquals(s.errors, 0);
283 <        assertEquals(s.completes, 1);
281 >        assertEquals(0, s.nexts);
282 >        assertEquals(0, s.errors);
283 >        assertEquals(1, s.completes, 1);
284      }
285  
286      /**
# Line 315 | Line 296 | public class SubmissionPublisherTest ext
296          assertSame(p.getClosedException(), ex);
297          p.subscribe(s);
298          s.awaitError();
299 <        assertEquals(s.nexts, 0);
300 <        assertEquals(s.errors, 1);
299 >        assertEquals(0, s.nexts);
300 >        assertEquals(1, s.errors);
301      }
302  
303      /**
# Line 328 | Line 309 | public class SubmissionPublisherTest ext
309          SubmissionPublisher<Integer> p = basicPublisher();
310          p.subscribe(s);
311          assertTrue(p.hasSubscribers());
312 <        assertEquals(p.getNumberOfSubscribers(), 1);
312 >        assertEquals(1, p.getNumberOfSubscribers());
313          assertTrue(p.getSubscribers().contains(s));
314          assertTrue(p.isSubscribed(s));
315          s.awaitSubscribe();
316          assertNotNull(s.sn);
317 <        assertEquals(s.nexts, 0);
318 <        assertEquals(s.errors, 0);
319 <        assertEquals(s.completes, 0);
317 >        assertEquals(0, s.nexts);
318 >        assertEquals(0, s.errors);
319 >        assertEquals(0, s.completes);
320          p.subscribe(s);
321          s.awaitError();
322 <        assertEquals(s.nexts, 0);
323 <        assertEquals(s.errors, 1);
322 >        assertEquals(0, s.nexts);
323 >        assertEquals(1, s.errors);
324          assertFalse(p.isSubscribed(s));
325      }
326  
# Line 354 | Line 335 | public class SubmissionPublisherTest ext
335              p.subscribe(s);
336          } catch (Exception ok) {}
337          s.awaitError();
338 <        assertEquals(s.nexts, 0);
339 <        assertEquals(s.errors, 1);
340 <        assertEquals(s.completes, 0);
338 >        assertEquals(0, s.nexts);
339 >        assertEquals(1, s.errors);
340 >        assertEquals(0, s.completes);
341      }
342  
343      /**
344 <     * subscribe(null) thows NPE
344 >     * subscribe(null) throws NPE
345       */
346      public void testSubscribe6() {
347          SubmissionPublisher<Integer> p = basicPublisher();
# Line 385 | Line 366 | public class SubmissionPublisherTest ext
366          assertTrue(p.isClosed());
367          assertNull(p.getClosedException());
368          s1.awaitComplete();
369 <        assertEquals(s1.nexts, 1);
370 <        assertEquals(s1.completes, 1);
369 >        assertEquals(1, s1.nexts);
370 >        assertEquals(1, s1.completes);
371          s2.awaitComplete();
372 <        assertEquals(s2.nexts, 1);
373 <        assertEquals(s2.completes, 1);
372 >        assertEquals(1, s2.nexts);
373 >        assertEquals(1, s2.completes);
374      }
375  
376      /**
377       * Closing a publisher exceptionally causes onError to subscribers
378 +     * after they are subscribed
379       */
380      public void testCloseExceptionallyError() {
381          SubmissionPublisher<Integer> p = basicPublisher();
# Line 404 | Line 386 | public class SubmissionPublisherTest ext
386          p.submit(1);
387          p.closeExceptionally(new SPException());
388          assertTrue(p.isClosed());
389 +        s1.awaitSubscribe();
390          s1.awaitError();
391          assertTrue(s1.nexts <= 1);
392 <        assertEquals(s1.errors, 1);
392 >        assertEquals(1, s1.errors);
393 >        s1.awaitSubscribe();
394          s2.awaitError();
395          assertTrue(s2.nexts <= 1);
396 <        assertEquals(s2.errors, 1);
396 >        assertEquals(1, s2.errors);
397      }
398  
399      /**
# Line 428 | Line 412 | public class SubmissionPublisherTest ext
412              p.submit(i);
413          p.close();
414          s2.awaitComplete();
415 <        assertEquals(s2.nexts, 20);
416 <        assertEquals(s2.completes, 1);
415 >        assertEquals(20, s2.nexts);
416 >        assertEquals(1, s2.completes);
417          assertTrue(s1.nexts < 20);
418          assertFalse(p.isSubscribed(s1));
419      }
# Line 449 | Line 433 | public class SubmissionPublisherTest ext
433          p.submit(2);
434          p.close();
435          s2.awaitComplete();
436 <        assertEquals(s2.nexts, 2);
436 >        assertEquals(2, s2.nexts);
437          s1.awaitComplete();
438 <        assertEquals(s1.errors, 1);
438 >        assertEquals(1, s1.errors);
439      }
440  
441      /**
442 <     * If a handler is supplied in conctructor, it is invoked when
442 >     * If a handler is supplied in constructor, it is invoked when
443       * subscriber throws an exception in onNext
444       */
445      public void testThrowOnNextHandler() {
# Line 473 | Line 457 | public class SubmissionPublisherTest ext
457          p.submit(2);
458          p.close();
459          s2.awaitComplete();
460 <        assertEquals(s2.nexts, 2);
461 <        assertEquals(s2.completes, 1);
460 >        assertEquals(2, s2.nexts);
461 >        assertEquals(1, s2.completes);
462          s1.awaitError();
463 <        assertEquals(s1.errors, 1);
464 <        assertEquals(calls.get(), 1);
463 >        assertEquals(1, s1.errors);
464 >        assertEquals(1, calls.get());
465      }
466  
467      /**
# Line 494 | Line 478 | public class SubmissionPublisherTest ext
478          p.close();
479          s2.awaitComplete();
480          s1.awaitComplete();
481 <        assertEquals(s2.nexts, 20);
482 <        assertEquals(s2.completes, 1);
483 <        assertEquals(s1.nexts, 20);
484 <        assertEquals(s1.completes, 1);
481 >        assertEquals(20, s2.nexts);
482 >        assertEquals(1, s2.completes);
483 >        assertEquals(20, s1.nexts);
484 >        assertEquals(1, s1.completes);
485      }
486  
487      /**
# Line 515 | Line 499 | public class SubmissionPublisherTest ext
499          p.submit(1);
500          p.submit(2);
501          s2.awaitNext(1);
502 <        assertEquals(s1.nexts, 0);
502 >        assertEquals(0, s1.nexts);
503          s1.sn.request(3);
504          p.submit(3);
505          p.close();
506          s2.awaitComplete();
507 <        assertEquals(s2.nexts, 3);
508 <        assertEquals(s2.completes, 1);
507 >        assertEquals(3, s2.nexts);
508 >        assertEquals(1, s2.completes);
509          s1.awaitComplete();
510          assertTrue(s1.nexts > 0);
511 <        assertEquals(s1.completes, 1);
511 >        assertEquals(1, s1.completes);
512      }
513  
514      /**
# Line 543 | Line 527 | public class SubmissionPublisherTest ext
527          p.submit(2);
528          p.close();
529          s2.awaitComplete();
530 <        assertEquals(s2.nexts, 2);
531 <        assertEquals(s2.completes, 1);
530 >        assertEquals(2, s2.nexts);
531 >        assertEquals(1, s2.completes);
532          s1.awaitNext(1);
533 <        assertEquals(s1.nexts, 1);
533 >        assertEquals(1, s1.nexts);
534      }
535  
536      /**
# Line 565 | Line 549 | public class SubmissionPublisherTest ext
549          p.submit(2);
550          p.close();
551          s2.awaitComplete();
552 <        assertEquals(s2.nexts, 2);
553 <        assertEquals(s2.completes, 1);
552 >        assertEquals(2, s2.nexts);
553 >        assertEquals(1, s2.completes);
554          s1.awaitError();
555 <        assertEquals(s1.errors, 1);
555 >        assertEquals(1, s1.errors);
556          assertTrue(s1.lastError instanceof IllegalArgumentException);
557      }
558  
# Line 582 | Line 566 | public class SubmissionPublisherTest ext
566          s.request = false;
567          p.subscribe(s);
568          s.awaitSubscribe();
569 <        assertEquals(p.estimateMinimumDemand(), 0);
569 >        assertEquals(0, p.estimateMinimumDemand());
570          s.sn.request(1);
571 <        assertEquals(p.estimateMinimumDemand(), 1);
571 >        assertEquals(1, p.estimateMinimumDemand());
572          p.submit(1);
573          s.awaitNext(1);
574 <        assertEquals(p.estimateMinimumDemand(), 0);
574 >        assertEquals(0, p.estimateMinimumDemand());
575      }
576  
577      /**
# Line 595 | Line 579 | public class SubmissionPublisherTest ext
579       */
580      public void testEmptySubmit() {
581          SubmissionPublisher<Integer> p = basicPublisher();
582 <        assertEquals(p.submit(1), 0);
582 >        assertEquals(0, p.submit(1));
583      }
584  
585      /**
# Line 623 | Line 607 | public class SubmissionPublisherTest ext
607          p.subscribe(s2);
608          s2.awaitSubscribe();
609          s1.awaitSubscribe();
610 <        assertEquals(p.submit(1), 1);
610 >        assertEquals(1, p.submit(1));
611          assertTrue(p.estimateMaximumLag() >= 1);
612          assertTrue(p.submit(2) >= 2);
613          assertTrue(p.estimateMaximumLag() >= 2);
# Line 634 | Line 618 | public class SubmissionPublisherTest ext
618          p.submit(4);
619          p.close();
620          s2.awaitComplete();
621 <        assertEquals(s2.nexts, 4);
621 >        assertEquals(4, s2.nexts);
622          s1.awaitComplete();
623 <        assertEquals(s2.nexts, 4);
623 >        assertEquals(4, s2.nexts);
624      }
625  
626      /**
# Line 656 | Line 640 | public class SubmissionPublisherTest ext
640          p.close();
641          s2.awaitComplete();
642          s1.awaitComplete();
643 <        assertEquals(s2.nexts, 20);
644 <        assertEquals(s2.completes, 1);
645 <        assertEquals(s1.nexts, 20);
646 <        assertEquals(s1.completes, 1);
643 >        assertEquals(20, s2.nexts);
644 >        assertEquals(1, s2.completes);
645 >        assertEquals(20, s1.nexts);
646 >        assertEquals(1, s1.completes);
647      }
648  
649      static boolean noopHandle(AtomicInteger count) {
# Line 713 | Line 697 | public class SubmissionPublisherTest ext
697          p.offer(4, null);
698          p.close();
699          s2.awaitComplete();
700 <        assertEquals(s2.nexts, 4);
700 >        assertEquals(4, s2.nexts);
701          s1.awaitComplete();
702 <        assertEquals(s2.nexts, 4);
702 >        assertEquals(4, s2.nexts);
703      }
704  
705      /**
# Line 774 | Line 758 | public class SubmissionPublisherTest ext
758          assertTrue(calls.get() >= 4);
759      }
760  
777 –
761      /**
762       * offer succeeds if drop handler forces request
763       */
# Line 798 | Line 781 | public class SubmissionPublisherTest ext
781          p.close();
782          s2.awaitComplete();
783          s1.awaitComplete();
784 <        assertEquals(s1.nexts + s2.nexts, n);
784 >        assertEquals(n, s1.nexts + s2.nexts);
785          assertTrue(calls.get() >= 2);
786      }
787  
805 –
788      /**
789       * Timed offer to a publisher with no subscribers returns lag 0
790       */
791      public void testEmptyTimedOffer() {
792          SubmissionPublisher<Integer> p = basicPublisher();
793 +        long startTime = System.nanoTime();
794          assertEquals(0, p.offer(1, LONG_DELAY_MS, MILLISECONDS, null));
795 +        assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS / 2);
796      }
797  
798      /**
# Line 816 | Line 800 | public class SubmissionPublisherTest ext
800       */
801      public void testNullTimedOffer() {
802          SubmissionPublisher<Integer> p = basicPublisher();
803 +        long startTime = System.nanoTime();
804          try {
805 <            p.offer(null, SHORT_DELAY_MS, MILLISECONDS, null);
805 >            p.offer(null, LONG_DELAY_MS, MILLISECONDS, null);
806              shouldThrow();
807          } catch (NullPointerException success) {}
808          try {
809 <            p.offer(1, SHORT_DELAY_MS, null, null);
809 >            p.offer(1, LONG_DELAY_MS, null, null);
810              shouldThrow();
811          } catch (NullPointerException success) {}
812 +        assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS / 2);
813      }
814  
815      /**
# Line 839 | Line 825 | public class SubmissionPublisherTest ext
825          p.subscribe(s2);
826          s2.awaitSubscribe();
827          s1.awaitSubscribe();
828 <        assertTrue(p.offer(1, SHORT_DELAY_MS, MILLISECONDS, null) >= 1);
829 <        assertTrue(p.offer(2, SHORT_DELAY_MS, MILLISECONDS, null) >= 2);
828 >        long startTime = System.nanoTime();
829 >        assertTrue(p.offer(1, LONG_DELAY_MS, MILLISECONDS, null) >= 1);
830 >        assertTrue(p.offer(2, LONG_DELAY_MS, MILLISECONDS, null) >= 2);
831          s1.sn.request(4);
832 <        assertTrue(p.offer(3, SHORT_DELAY_MS, MILLISECONDS, null) >= 3);
832 >        assertTrue(p.offer(3, LONG_DELAY_MS, MILLISECONDS, null) >= 3);
833          s2.sn.request(4);
834 <        p.offer(4, SHORT_DELAY_MS, MILLISECONDS, null);
834 >        p.offer(4, LONG_DELAY_MS, MILLISECONDS, null);
835          p.close();
836          s2.awaitComplete();
837 <        assertEquals(s2.nexts, 4);
837 >        assertEquals(4, s2.nexts);
838          s1.awaitComplete();
839 <        assertEquals(s2.nexts, 4);
839 >        assertEquals(4, s2.nexts);
840 >        assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS / 2);
841      }
842  
843      /**
# Line 866 | Line 854 | public class SubmissionPublisherTest ext
854          p.subscribe(s2);
855          s2.awaitSubscribe();
856          s1.awaitSubscribe();
857 +        long delay = timeoutMillis();
858          for (int i = 1; i <= 4; ++i)
859 <            assertTrue(p.offer(i, SHORT_DELAY_MS, MILLISECONDS, null) >= 0);
860 <        p.offer(5, SHORT_DELAY_MS, MILLISECONDS, null);
861 <        assertTrue(p.offer(6, SHORT_DELAY_MS, MILLISECONDS, null) < 0);
859 >            assertTrue(p.offer(i, delay, MILLISECONDS, null) >= 0);
860 >        long startTime = System.nanoTime();
861 >        assertTrue(p.offer(5, delay, MILLISECONDS, null) < 0);
862          s1.sn.request(64);
863 <        assertTrue(p.offer(7, SHORT_DELAY_MS, MILLISECONDS, null) < 0);
863 >        assertTrue(p.offer(6, delay, MILLISECONDS, null) < 0);
864 >        // 2 * delay should elapse but check only 1 * delay to allow timer slop
865 >        assertTrue(millisElapsedSince(startTime) >= delay);
866          s2.sn.request(64);
867          p.close();
868          s2.awaitComplete();
# Line 895 | Line 886 | public class SubmissionPublisherTest ext
886          p.subscribe(s2);
887          s2.awaitSubscribe();
888          s1.awaitSubscribe();
889 +        long delay = timeoutMillis();
890          for (int i = 1; i <= 4; ++i)
891 <            assertTrue(p.offer(i, SHORT_DELAY_MS, MILLISECONDS, (s, x) -> noopHandle(calls)) >= 0);
892 <        p.offer(5, (s, x) -> noopHandle(calls));
893 <        assertTrue(p.offer(6, SHORT_DELAY_MS, MILLISECONDS, (s, x) -> noopHandle(calls)) < 0);
891 >            assertTrue(p.offer(i, delay, MILLISECONDS, (s, x) -> noopHandle(calls)) >= 0);
892 >        long startTime = System.nanoTime();
893 >        assertTrue(p.offer(5, delay, MILLISECONDS, (s, x) -> noopHandle(calls)) < 0);
894          s1.sn.request(64);
895 <        assertTrue(p.offer(7, SHORT_DELAY_MS, MILLISECONDS, (s, x) -> noopHandle(calls)) < 0);
895 >        assertTrue(p.offer(6, delay, MILLISECONDS, (s, x) -> noopHandle(calls)) < 0);
896 >        assertTrue(millisElapsedSince(startTime) >= delay);
897          s2.sn.request(64);
898          p.close();
899          s2.awaitComplete();
# Line 924 | Line 917 | public class SubmissionPublisherTest ext
917          s2.awaitSubscribe();
918          s1.awaitSubscribe();
919          int n = 0;
920 <        for (int i = 1; i <= 8; ++i) {
921 <            int d = p.offer(i, SHORT_DELAY_MS, MILLISECONDS, (s, x) -> reqHandle(calls, s));
920 >        long delay = timeoutMillis();
921 >        long startTime = System.nanoTime();
922 >        for (int i = 1; i <= 6; ++i) {
923 >            int d = p.offer(i, delay, MILLISECONDS, (s, x) -> reqHandle(calls, s));
924              n = n + 2 + (d < 0 ? d : 0);
925          }
926 +        assertTrue(millisElapsedSince(startTime) >= delay);
927          p.close();
928          s2.awaitComplete();
929          s1.awaitComplete();
930 <        assertEquals(s1.nexts + s2.nexts, n);
930 >        assertEquals(n, s1.nexts + s2.nexts);
931          assertTrue(calls.get() >= 2);
932      }
933  
934 +    /**
935 +     * consume returns a CompletableFuture that is done when
936 +     * publisher completes
937 +     */
938 +    public void testConsume() {
939 +        AtomicInteger sum = new AtomicInteger();
940 +        SubmissionPublisher<Integer> p = basicPublisher();
941 +        CompletableFuture<Void> f =
942 +            p.consume((Integer x) -> sum.getAndAdd(x.intValue()));
943 +        int n = 20;
944 +        for (int i = 1; i <= n; ++i)
945 +            p.submit(i);
946 +        p.close();
947 +        f.join();
948 +        assertEquals((n * (n + 1)) / 2, sum.get());
949 +    }
950 +
951 +    /**
952 +     * consume(null) throws NPE
953 +     */
954 +    public void testConsumeNPE() {
955 +        SubmissionPublisher<Integer> p = basicPublisher();
956 +        try {
957 +            CompletableFuture<Void> f = p.consume(null);
958 +            shouldThrow();
959 +        } catch (NullPointerException success) {}
960 +    }
961 +
962 +    /**
963 +     * consume eventually stops processing published items if cancelled
964 +     */
965 +    public void testCancelledConsume() {
966 +        AtomicInteger count = new AtomicInteger();
967 +        SubmissionPublisher<Integer> p = basicPublisher();
968 +        CompletableFuture<Void> f = p.consume(x -> count.getAndIncrement());
969 +        f.cancel(true);
970 +        int n = 1000000; // arbitrary limit
971 +        for (int i = 1; i <= n; ++i)
972 +            p.submit(i);
973 +        assertTrue(count.get() < n);
974 +    }
975  
976   }

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