Examples of java.util.concurrent.BlockingQueue.poll()

Class java.util.concurrent.BlockingQueue

Examples of java.util.concurrent.BlockingQueue.poll()

java.util.concurrent.BlockingQueue.poll()
Retrieves and removes the head of this queue, waiting up to the specified wait time if necessary for an element to become available. @param timeout how long to wait before giving up, in units of{@code unit} @param unit a {@code TimeUnit} determining how to interpret the{@code timeout} parameter @return the head of this queue, or {@code null} if thespecified waiting time elapses before an element is available @throws InterruptedException if interrupted while waiting

                assertNull(q.poll(timeoutMillis(), MILLISECONDS));
                assertTrue(millisElapsedSince(startTime) >= timeoutMillis());


                barrier.await();


                assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS));


                Thread.currentThread().interrupt();
                try {
                    q.poll(LONG_DELAY_MS, MILLISECONDS);
                    shouldThrow();

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                assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS));


                Thread.currentThread().interrupt();
                try {
                    q.poll(LONG_DELAY_MS, MILLISECONDS);
                    shouldThrow();
                } catch (InterruptedException success) {
                }
                assertFalse(Thread.interrupted());

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                }
                assertFalse(Thread.interrupted());


                barrier.await();
                try {
                    q.poll(LONG_DELAY_MS, MILLISECONDS);
                    shouldThrow();
                } catch (InterruptedException success) {
                }
                assertFalse(Thread.interrupted());
            }

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        final CountDownLatch threadStarted = new CountDownLatch(1);
        Thread t = newStartedThread(new CheckedRunnable() {
            public void realRun() {
                threadStarted.countDown();
                try {
                    q.poll(2 * LONG_DELAY_MS, MILLISECONDS);
                    shouldThrow();
                } catch (InterruptedException success) {
                }
                assertFalse(Thread.interrupted());
            }

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            ints[i] = new Integer(i);
        BlockingQueue q = new LocalConcurrentBlockingObjectQueue(SIZE);
        assertFalse(q.addAll(Arrays.asList(empty)));
        assertTrue(q.addAll(Arrays.asList(ints)));
        for (int i = 0; i < SIZE; ++i)
            assertEquals(ints[i], q.poll());
    }


    /**
     * all elements successfully put are contained
     */

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        final BlockingQueue q = emptyCollection();
        Thread t = newStartedThread(new CheckedRunnable() {
            public void realRun() {
                Thread.currentThread().interrupt();
                try {
                    q.poll(2 * LONG_DELAY_MS, MILLISECONDS);
                    shouldThrow();
                } catch (InterruptedException success) {
                }
                assertFalse(Thread.interrupted());
            }

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     */
    @Test
    public void testPoll() {
        BlockingQueue q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, q.poll());
        }
        assertNull(q.poll());
    }


    /**

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    public void testPoll() {
        BlockingQueue q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, q.poll());
        }
        assertNull(q.poll());
    }


    /**
     * timed poll with zero timeout succeeds when non-empty, else times out
     */

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     */
    @Test
    public void testTimedPoll0() throws InterruptedException {
        BlockingQueue q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, q.poll(0, MILLISECONDS));
        }
        assertNull(q.poll(0, MILLISECONDS));
        checkEmpty(q);
    }

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    public void testTimedPoll0() throws InterruptedException {
        BlockingQueue q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, q.poll(0, MILLISECONDS));
        }
        assertNull(q.poll(0, MILLISECONDS));
        checkEmpty(q);
    }


    /**
     * timed poll with nonzero timeout succeeds when non-empty, else times out

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