Examples of java.util.concurrent.DelayQueue

java.util.concurrent.DelayQueue

An unbounded {@linkplain BlockingQueue blocking queue} of{@code Delayed} elements, in which an element can only be takenwhen its delay has expired. The head of the queue is that {@code Delayed} element whose delay expired furthest in thepast. If no delay has expired there is no head and {@code poll}will return {@code null}. Expiration occurs when an element's {@code getDelay(TimeUnit.NANOSECONDS)} method returns a value lessthan or equal to zero. Even though unexpired elements cannot be removed using {@code take} or {@code poll}, they are otherwise treated as normal elements. For example, the {@code size} methodreturns the count of both expired and unexpired elements. This queue does not permit null elements.

This class and its iterator implement all of the optional methods of the {@link Collection} and {@link Iterator} interfaces. The Iterator provided in method {@link #iterator()} is not guaranteed to traverse the elements ofthe DelayQueue in any particular order.

This class is a member of the Java Collections Framework. @since 1.5 @author Doug Lea @param < E> the type of elements held in this collection

  @SuppressWarnings("unchecked")
  public void start() {
    if (executor != null) {
      throw new IllegalStateException("Already started");
    }
    DelayQueue preStartQueue = queue;


    queue = new DelayQueue();
    executor = new ThreadPoolExecutor(threadPoolSize, threadPoolSize, 0,
      TimeUnit.MILLISECONDS, queue);
    executor.prestartAllCoreThreads();


    startTimeMS = System.currentTimeMillis();

  private int threadPoolSize;
  private ThreadPoolExecutor executor;
  private long startTimeMS = 0;
  
  public TaskRunner() {
    queue = new DelayQueue();
  }

  @SuppressWarnings("unchecked")
  public void start() {
    if (executor != null) {
      throw new IllegalStateException("Already started");
    }
    DelayQueue preStartQueue = queue;


    queue = new DelayQueue();
    executor = new ThreadPoolExecutor(threadPoolSize, threadPoolSize, 0,
      TimeUnit.MILLISECONDS, queue);
    executor.prestartAllCoreThreads();


    startTimeMS = System.currentTimeMillis();

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