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

Class java.util.concurrent.BlockingQueue

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

java.util.concurrent.BlockingQueue.offer()
Inserts the specified element into this queue if it is possible to do so immediately without violating capacity restrictions, returning {@code true} upon success and {@code false} if no space is currentlyavailable. When using a capacity-restricted queue, this method is generally preferable to {@link #add}, which can fail to insert an element only by throwing an exception. @param e the element to add @return {@code true} if the element was added to this queue, else{@code false} @throws ClassCastException if the class of the specified elementprevents it from being added to this queue @throws NullPointerException if the specified element is null @throws IllegalArgumentException if some property of the specifiedelement prevents it from being added to this queue

     */
    @Test
    public void testOffer() {
        BlockingQueue q = new LocalConcurrentBlockingObjectQueue(1);
        assertTrue(q.offer(zero));
        assertFalse(q.offer(one));
    }


    /**
     * add succeeds if not full; throws ISE if full
     */

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            }
        });


        barrier.await();
        long startTime = System.nanoTime();
        assertTrue(q.offer(zero, LONG_DELAY_MS, MILLISECONDS));
        assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);


        barrier.await();
        assertThreadStaysAlive(t);
        t.interrupt();

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        Thread t = newStartedThread(new CheckedRunnable() {
            public void realRun() throws InterruptedException {
                q.put(new Object());
                q.put(new Object());
                long startTime = System.nanoTime();
                assertFalse(q.offer(new Object(), timeoutMillis(), MILLISECONDS));
                assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
                pleaseInterrupt.countDown();
                try {
                    q.offer(new Object(), 2 * LONG_DELAY_MS, MILLISECONDS);
                    shouldThrow();

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                long startTime = System.nanoTime();
                assertFalse(q.offer(new Object(), timeoutMillis(), MILLISECONDS));
                assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
                pleaseInterrupt.countDown();
                try {
                    q.offer(new Object(), 2 * LONG_DELAY_MS, MILLISECONDS);
                    shouldThrow();
                } catch (InterruptedException success) {
                }
            }
        });

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        Thread t = newStartedThread(new CheckedRunnable() {
            public void realRun() throws Exception {
                q.put(new Object());
                q.put(new Object());
                long startTime = System.nanoTime();
                assertFalse(q.offer(new Object(), timeoutMillis(), MILLISECONDS));
                assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
                pleaseInterrupt.countDown();
                try {
                    q.offer(new Object(), 2 * LONG_DELAY_MS, MILLISECONDS);
                    shouldThrow();

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                long startTime = System.nanoTime();
                assertFalse(q.offer(new Object(), timeoutMillis(), MILLISECONDS));
                assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
                pleaseInterrupt.countDown();
                try {
                    q.offer(new Object(), 2 * LONG_DELAY_MS, MILLISECONDS);
                    shouldThrow();
                } catch (InterruptedException success) {
                }
            }
        });

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    @Test
    public void testDrainToN() throws IOException {
        BlockingQueue q = new SharedConcurrentBlockingObjectQueue<Integer>(SIZE * 2, Integer.class);
        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());

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     */
    private BlockingQueue populatedQueue(int n) {
        BlockingQueue q = new LocalConcurrentBlockingObjectQueue(n);
        assertTrue(q.isEmpty());
        for (int i = 0; i < n; i++)
            assertTrue(q.offer(new Integer(i)));
        assertFalse(q.isEmpty());
        assertEquals(0, q.remainingCapacity());
        assertEquals(n, q.size());
        return q;
    }

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         return false;
      }


      private void tryAddKey(Address address, Object key) {
         BlockingQueue queue = address2key.get(address);
         boolean added = queue.offer(key);
         if (added) {
            exitingNumberOfKeys.incrementAndGet();
         }
         if (log.isTraceEnabled()) {
            log.trace((added ? "Successfully" : "Not") + " added key(" + key + ") to the address(" + address + ").");

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    final BlockingQueue q = getQueue(10);
    long startTime = System.nanoTime();
    Assert.assertNull(q.poll(delayMS, TimeUnit.MILLISECONDS));
    Assert.assertTrue(TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - startTime) >= delayMS);
    TestObject obj = new TestObject(2);
    Assert.assertTrue(q.offer(obj, delayMS, TimeUnit.MILLISECONDS));
    Assert.assertSame(obj, q.poll(delayMS, TimeUnit.MILLISECONDS));


    Thread.currentThread().interrupt();
    try {
      q.poll(delayMS, TimeUnit.MILLISECONDS);

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