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

    @Test
    public void testTimedPoll() throws InterruptedException {
        BlockingQueue q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            long startTime = System.nanoTime();
            assertEquals(i, q.poll(LONG_DELAY_MS, MILLISECONDS));
            assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
        }
        long startTime = System.nanoTime();
        assertNull(q.poll(timeoutMillis(), MILLISECONDS));
        assertTrue(millisElapsedSince(startTime) >= timeoutMillis());

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            long startTime = System.nanoTime();
            assertEquals(i, q.poll(LONG_DELAY_MS, MILLISECONDS));
            assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
        }
        long startTime = System.nanoTime();
        assertNull(q.poll(timeoutMillis(), MILLISECONDS));
        assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
        checkEmpty(q);
    }


    /**

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    @Test
    public void testPeek() {
        BlockingQueue q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, q.peek());
            assertEquals(i, q.poll());
            assertTrue(q.peek() == null ||
                    !q.peek().equals(i));
        }
        assertNull(q.peek());
    }

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    @Test
    public void testElement() {
        BlockingQueue q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, q.element());
            assertEquals(i, q.poll());
        }
        try {
            q.element();
            shouldThrow();
        } catch (NoSuchElementException success) {

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    @Test
    public void testContains() {
        BlockingQueue q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertTrue(q.contains(new Integer(i)));
            assertEquals(i, q.poll());
            assertFalse(q.contains(new Integer(i)));
        }
    }


    /**

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            q.add(i);
        }
        // Provoke wraparound
        for (int i = 0; i < SIZE; i++) {
            checkToArray(q);
            assertEquals(i, q.poll());
            checkToArray(q);
            q.add(SIZE + i);
        }
        for (int i = 0; i < SIZE; i++) {
            checkToArray(q);

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            checkToArray(q);
            q.add(SIZE + i);
        }
        for (int i = 0; i < SIZE; i++) {
            checkToArray(q);
            assertEquals(SIZE + i, q.poll());
        }
    }


    void checkToArray2(BlockingQueue q) {
        int size = q.size();

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            q.add(i);
        }
        // Provoke wraparound
        for (int i = 0; i < SIZE; i++) {
            checkToArray2(q);
            assertEquals(i, q.poll());
            checkToArray2(q);
            q.add(SIZE + i);
        }
        for (int i = 0; i < SIZE; i++) {
            checkToArray2(q);

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            checkToArray2(q);
            q.add(SIZE + i);
        }
        for (int i = 0; i < SIZE; i++) {
            checkToArray2(q);
            assertEquals(SIZE + i, q.poll());
        }
    }


    /**
     * toArray(incompatible array type) throws ArrayStoreException

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


    /**

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