java.util.concurrent.ThreadPoolExecutor.DiscardOldestPolicy Java Examples

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Example #1
Source File: SaturationPolicyUnitTest.java    From tutorials with MIT License 5 votes vote down vote up 
@Test
public void givenDiscardOldestPolicy_WhenSaturated_ThenExecutorDiscardsTheOldestTask() {
    executor = new ThreadPoolExecutor(1, 1, 0, MILLISECONDS, new ArrayBlockingQueue<>(2), new DiscardOldestPolicy());
    executor.execute(() -> waitFor(100));

    BlockingQueue<String> queue = new LinkedBlockingDeque<>();
    executor.execute(() -> queue.offer("First"));
    executor.execute(() -> queue.offer("Second"));
    executor.execute(() -> queue.offer("Third"));

    waitFor(150);
    List<String> results = new ArrayList<>();
    queue.drainTo(results);
    assertThat(results).containsExactlyInAnyOrder("Second", "Third");
}