Examples with LinkedTransferQueue java.util.concurrent.LinkedTransferQueue used on opensource projects

Example 41 with LinkedTransferQueue

use of java.util.concurrent.LinkedTransferQueue in project mapdb by jankotek.

the class LinkedTransferQueueTest method testTransfer4.

/**
     * transfer waits until a poll occurs, at which point the polling
     * thread returns the element
     */
public void testTransfer4() throws InterruptedException {
    final LinkedTransferQueue q = new LinkedTransferQueue();
    Thread t = newStartedThread(new CheckedRunnable() {

        public void realRun() throws InterruptedException {
            q.transfer(four);
            assertFalse(q.contains(four));
            assertSame(three, q.poll());
        }
    });
    while (q.isEmpty()) Thread.yield();
    assertFalse(q.isEmpty());
    assertEquals(1, q.size());
    assertTrue(q.offer(three));
    assertSame(four, q.poll());
    awaitTermination(t);
}

Example 42 with LinkedTransferQueue

use of java.util.concurrent.LinkedTransferQueue in project mapdb by jankotek.

the class LinkedTransferQueueTest method testTryTransfer4.

/**
     * If there is a consumer waiting in take, tryTransfer returns
     * true while successfully transfering object.
     */
public void testTryTransfer4() throws InterruptedException {
    final Object hotPotato = new Object();
    final LinkedTransferQueue q = new LinkedTransferQueue();
    Thread t = newStartedThread(new CheckedRunnable() {

        public void realRun() {
            while (!q.hasWaitingConsumer()) Thread.yield();
            assertTrue(q.hasWaitingConsumer());
            checkEmpty(q);
            assertTrue(q.tryTransfer(hotPotato));
        }
    });
    assertSame(q.take(), hotPotato);
    checkEmpty(q);
    awaitTermination(t);
}

Example 43 with LinkedTransferQueue

use of java.util.concurrent.LinkedTransferQueue in project mapdb by jankotek.

the class LinkedTransferQueueTest method testTryTransfer3.

/**
     * If there is a consumer waiting in timed poll, tryTransfer
     * returns true while successfully transfering object.
     */
public void testTryTransfer3() throws InterruptedException {
    final Object hotPotato = new Object();
    final LinkedTransferQueue q = new LinkedTransferQueue();
    Thread t = newStartedThread(new CheckedRunnable() {

        public void realRun() {
            while (!q.hasWaitingConsumer()) Thread.yield();
            assertTrue(q.hasWaitingConsumer());
            checkEmpty(q);
            assertTrue(q.tryTransfer(hotPotato));
        }
    });
    long startTime = System.nanoTime();
    assertSame(hotPotato, q.poll(LONG_DELAY_MS, MILLISECONDS));
    assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
    checkEmpty(q);
    awaitTermination(t);
}

Example 44 with LinkedTransferQueue

use of java.util.concurrent.LinkedTransferQueue in project mapdb by jankotek.

the class LinkedTransferQueueTest method testTryTransfer8.

/**
     * tryTransfer attempts to enqueue into the queue and fails
     * returning false not enqueueing and the successive poll is null
     */
public void testTryTransfer8() throws InterruptedException {
    final LinkedTransferQueue q = new LinkedTransferQueue();
    assertTrue(q.offer(four));
    assertEquals(1, q.size());
    long startTime = System.nanoTime();
    assertFalse(q.tryTransfer(five, timeoutMillis(), MILLISECONDS));
    assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
    assertEquals(1, q.size());
    assertSame(four, q.poll());
    assertNull(q.poll());
    checkEmpty(q);
}

Example 45 with LinkedTransferQueue

use of java.util.concurrent.LinkedTransferQueue in project mapdb by jankotek.

the class LinkedTransferQueueTest method testTryTransfer2.

/**
     * tryTransfer returns false and does not enqueue if there are no
     * consumers waiting to poll or take.
     */
public void testTryTransfer2() throws InterruptedException {
    final LinkedTransferQueue q = new LinkedTransferQueue();
    assertFalse(q.tryTransfer(new Object()));
    assertFalse(q.hasWaitingConsumer());
    checkEmpty(q);
}