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Java Source Code / Java Documentation » Apache Harmony Java SE » java package » java.util.concurrent

Source Cross Reference Class Diagram Java Document (Java Doc)

java.util.concurrent .DelayQueue

DelayQueue

public class DelayQueue extends AbstractQueue implements BlockingQueue<E>(Code)

An unbounded of Delayed elements, in which an element can only be taken when its delay has expired. The head of the queue is that Delayed element whose delay expired furthest in the past - if no delay has expired there is no head and poll will return null. This queue does not permit null elements.

This class implements all of the optional methods of the Collection and Iterator interfaces.

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

Constructor Summary
public	DelayQueue() Creates a new `DelayQueue` that is initially empty.
public	DelayQueue(Collection<? extends E> c) Creates a `DelayQueue` initially containing the elements of the given collection of Delayed instances.

Method Summary
public boolean	add(E o) Adds the specified element to this queue.
public void	clear() Atomically removes all of the elements from this delay queue.
public int	drainTo(Collection<? super E> c)
public int	drainTo(Collection<? super E> c, int maxElements)
public Iterator<E>	iterator() Returns an iterator over the elements in this queue.
public boolean	offer(E o) Inserts the specified element into this delay queue.
public boolean	offer(E o, long timeout, TimeUnit unit) Inserts the specified element into this delay queue.
public E	peek()
public E	poll(long time, TimeUnit unit)
public E	poll()
public void	put(E o) Adds the specified element to this delay queue.
public int	remainingCapacity() Always returns `Integer.MAX_VALUE` because a `DelayQueue` is not capacity constrained.
public boolean	remove(Object o)
public int	size()
public E	take()
public Object[]	toArray()
public T[]	toArray(T[] array)

Constructor Detail

DelayQueue
public DelayQueue()(Code)
	Creates a new `DelayQueue` that is initially empty.

DelayQueue
public DelayQueue(Collection<? extends E> c)(Code)
	Creates a `DelayQueue` initially containing the elements of the given collection of Delayed instances. Parameters: c - the collection throws: NullPointerException - if `c` or any element within itis `null`

Method Detail

add
public boolean add(E o)(Code)
	Adds the specified element to this queue. Parameters: o - the element to add `true` (as per the general contract of`Collection.add`). throws: NullPointerException - if the specified element is `null`.

clear
public void clear()(Code)
	Atomically removes all of the elements from this delay queue. The queue will be empty after this call returns.

drainTo
public int drainTo(Collection<? super E> c)(Code)

drainTo
public int drainTo(Collection<? super E> c, int maxElements)(Code)

iterator
public Iterator<E> iterator()(Code)
	Returns an iterator over the elements in this queue. The iterator does not return the elements in any particular order. The returned iterator is a thread-safe "fast-fail" iterator that will throw java.util.ConcurrentModificationException upon detected interference. an iterator over the elements in this queue.

offer
public boolean offer(E o)(Code)
	Inserts the specified element into this delay queue. Parameters: o - the element to add `true` throws: NullPointerException - if the specified element is `null`.

offer
public boolean offer(E o, long timeout, TimeUnit unit)(Code)
	Inserts the specified element into this delay queue. As the queue is unbounded this method will never block. Parameters: o - the element to add Parameters: timeout - This parameter is ignored as the method never blocks Parameters: unit - This parameter is ignored as the method never blocks `true` throws: NullPointerException - if the specified element is `null`.

peek
public E peek()(Code)

poll
public E poll(long time, TimeUnit unit) throws InterruptedException(Code)

poll
public E poll()(Code)

put
public void put(E o)(Code)
	Adds the specified element to this delay queue. As the queue is unbounded this method will never block. Parameters: o - the element to add throws: NullPointerException - if the specified element is `null`.

remainingCapacity
public int remainingCapacity()(Code)
	Always returns `Integer.MAX_VALUE` because a `DelayQueue` is not capacity constrained. `Integer.MAX_VALUE`

remove
public boolean remove(Object o)(Code)

size
public int size()(Code)

take
public E take() throws InterruptedException(Code)

toArray
public Object[] toArray()(Code)

toArray
public T[] toArray(T[] array)(Code)

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