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

Class java.util.concurrent.BlockingQueue

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

java.util.concurrent.BlockingQueue.drainTo()
Removes all available elements from this queue and adds them to the given collection. This operation may be more efficient than repeatedly polling this queue. A failure encountered while attempting to add elements to collection {@code c} may result in elements being in neither,either or both collections when the associated exception is thrown. Attempts to drain a queue to itself result in {@code IllegalArgumentException}. Further, the behavior of this operation is undefined if the specified collection is modified while the operation is in progress. @param c the collection to transfer elements into @return the number of elements transferred @throws UnsupportedOperationException if addition of elementsis not supported by the specified collection @throws ClassCastException if the class of an element of this queueprevents it from being added to the specified collection @throws NullPointerException if the specified collection is null @throws IllegalArgumentException if the specified collection is thisqueue, or some property of an element of this queue prevents it from being added to the specified collection

    @Test
    @Ignore
    public void testDrainTo() {
        BlockingQueue q = populatedQueue(SIZE);
        ArrayList l = new ArrayList();
        q.drainTo(l);
        assertEquals(0, q.size());
        assertEquals(SIZE, l.size());
        for (int i = 0; i < SIZE; ++i)
            assertEquals(l.get(i), new Integer(i));
        q.add(zero);

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        q.add(one);
        assertFalse(q.isEmpty());
        assertTrue(q.contains(zero));
        assertTrue(q.contains(one));
        l.clear();
        q.drainTo(l);
        assertEquals(0, q.size());
        assertEquals(2, l.size());
        for (int i = 0; i < 2; ++i)
            assertEquals(l.get(i), new Integer(i));
    }

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            }
        });


        t.start();
        ArrayList l = new ArrayList();
        q.drainTo(l);
        assertTrue(l.size() >= SIZE);
        for (int i = 0; i < SIZE; ++i)
            assertEquals(l.get(i), new Integer(i));
        t.join();
        assertTrue(q.size() + l.size() >= SIZE);

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        BlockingQueue q = new LocalConcurrentBlockingObjectQueue(SIZE * 2);
        for (int i = 0; i < SIZE + 2; ++i) {
            for (int j = 0; j < SIZE; j++)
                assertTrue(q.offer(new Integer(j)));
            ArrayList l = new ArrayList();
            q.drainTo(l, i);
            int k = (i < SIZE) ? i : SIZE;
            assertEquals(k, l.size());
            assertEquals(SIZE - k, q.size());
            for (int j = 0; j < k; ++j)
                assertEquals(l.get(j), new Integer(j));

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     * drainTo(null) throws NullPointerException
     */
    public void testDrainToNull() {
        final BlockingQueue q = emptyCollection();
        try {
            q.drainTo(null);
            shouldThrow();
        } catch (NullPointerException success) {
        }
    }

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     * drainTo(this) throws IllegalArgumentException
     */
    public void testDrainToSelf() {
        final BlockingQueue q = emptyCollection();
        try {
            q.drainTo(q);
            shouldThrow();
        } catch (IllegalArgumentException success) {
        }
    }

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     * drainTo(null, n) throws NullPointerException
     */
    public void testDrainToNullN() {
        final BlockingQueue q = emptyCollection();
        try {
            q.drainTo(null, 0);
            shouldThrow();
        } catch (NullPointerException success) {
        }
    }

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     * drainTo(this, n) throws IllegalArgumentException
     */
    public void testDrainToSelfN() {
        final BlockingQueue q = emptyCollection();
        try {
            q.drainTo(q, 0);
            shouldThrow();
        } catch (IllegalArgumentException success) {
        }
    }

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     */
    public void testDrainToNonPositiveMaxElements() {
        final BlockingQueue q = emptyCollection();
        final int[] ns = {0, -1, -42, Integer.MIN_VALUE};
        for (int n : ns)
            assertEquals(0, q.drainTo(new ArrayList(), n));
        if (q.remainingCapacity() > 0) {
            // Not SynchronousQueue, that is
            Object one = makeElement(1);
            q.add(one);
            ArrayList c = new ArrayList();

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            // Not SynchronousQueue, that is
            Object one = makeElement(1);
            q.add(one);
            ArrayList c = new ArrayList();
            for (int n : ns)
                assertEquals(0, q.drainTo(new ArrayList(), n));
            assertEquals(1, q.size());
            assertSame(one, q.poll());
            assertTrue(c.isEmpty());
        }
    }

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